There is something wonderfully chaotic about the premise of Isekai Princess: Monster Siege. Take a princess who has lost her kingdom, a modern soldier who has spent far too long fighting in a seemingly endless war, throw them both into an unfamiliar fantasy world, and arm them with an assortment of very modern firearms. Then add a loyal pet dragon, an army of monsters and a succession of increasingly dangerous bosses. It is an unusual combination, certainly, but one that gives this 2D action shooter an identity of its own. Developed and published by TROOOZE, the game embraces its anime-inspired setting and arcade sensibilities, delivering a straightforward action experience built around shooting, survival and the satisfaction of making it through one more stage.
The story begins with two women from completely different worlds. Princess Lucia has watched her homeland fall to the Demon Lord’s army, leaving her with the enormous task of finding a way to reclaim what has been taken from her. Soldier Yuna, meanwhile, comes from a world consumed by a war that seems to have no end, and her own desire is simply to escape the violence and find a place where she can live in peace. Their paths cross when a mysterious light transports them both into an unfamiliar world, where neither has any idea how they arrived or what awaits them. Before they can make sense of their situation, however, monsters appear, leaving them with little choice but to fight together.
It is a familiar isekai setup, but the contrast between Lucia and Yuna gives the premise a little personality. One is a displaced fantasy princess, the other a hardened soldier, and their different backgrounds create an appealing foundation for the adventure. Their motivations are also refreshingly easy to understand. Lucia wants her home back, while Yuna longs for a life beyond the battlefield. Neither is chasing some grand abstract destiny for the sake of it. They simply want to return to the people and places that matter to them, and that gives the journey a straightforward emotional purpose.
Two heroines, two approaches to battle
One of the game’s biggest attractions is the choice between its two protagonists. Lucia and Yuna are not simply different character portraits attached to the same adventure. Their contrasting identities give the action its flavour, with the fantasy princess and modern soldier bringing distinct personalities to a world filled with hostile creatures. Having that choice from the outset is a welcome touch, particularly for a game whose central appeal rests on replaying stages, improving your equipment and finding a rhythm that suits your preferred approach.
The firearms are an amusing part of the game’s identity. Seeing a princess from a fantasy kingdom take on monstrous creatures with a pistol or rifle is an entertaining contrast, while Yuna’s military background makes the use of modern weaponry feel more immediately natural. There is a certain charm to watching these two very different heroines deal with an otherwise conventional fantasy threat using equipment that would look more at home in a contemporary action shooter. It helps distinguish Isekai Princess: Monster Siege from the countless fantasy games in which swords, bows and magical spells do most of the talking.
At its core, the gameplay is built around fast, accessible shooting action. Enemies arrive in groups, stages provide a succession of encounters, and survival depends on keeping your character moving while dealing with threats approaching from different directions. The controls are designed to be easy to understand, which means players can get into the action without spending ages learning complicated systems. That accessibility is important for an arcade-style shooter, where the enjoyment comes from reacting to what is happening on screen rather than wrestling with the controls.
However, simplicity does not mean there is nothing to master. Knowing when to attack, when to reposition and how to deal with larger groups of enemies becomes increasingly important as the adventure progresses. A weapon that feels perfectly adequate against smaller creatures may not be the best choice when a tougher opponent appears, and careless positioning can quickly turn a manageable encounter into a desperate scramble for survival. The best moments come when everything starts happening at once and you have to make quick decisions rather than simply holding down the attack button and hoping for the best.
Upgrades, hidden items and a helpful little dragon
Progression gives the shooting a welcome sense of purpose. Money collected during stages can be spent in the shop on new weapons and upgrades, allowing players to strengthen their chosen heroine as enemies grow more dangerous. Upgrades cover key areas such as weapon power, health and attack range, giving you several ways to improve your chances of survival. There is a satisfying sense of reward in returning to the action with better equipment, particularly when an earlier encounter that caused problems suddenly becomes much more manageable.
The ability to shape your upgrades around your own preferences is particularly welcome. Some players will naturally prioritise raw damage, aiming to remove enemies before they become a serious threat. Others may prefer to improve their health or attack range, creating a more forgiving experience when the screen becomes crowded. This gives the progression system a little more personality than simply handing out increasingly powerful weapons at fixed intervals. Every improvement has a practical purpose, and choosing where to spend your hard-earned money becomes part of the wider strategy.
There are also hidden survival items to discover throughout the stages. These provide an additional reason to pay attention to your surroundings rather than concentrating exclusively on whatever happens to be trying to tear you apart. In a game focused so heavily on combat, small discoveries like these help break up the straightforward shooting routine and reward players who take the time to explore. They also add a useful extra consideration to stage progression, particularly when health and survival become increasingly important.
Then there is your pet dragon, which deserves a mention of its own. Having a little companion capable of unleashing a powerful special attack is a lovely addition to the overall package, especially when surrounded by a particularly unpleasant collection of monsters. Its intervention provides a welcome burst of extra firepower and can help turn the tide when an encounter becomes overwhelming. It also adds a little personality to the battlefield, because a game featuring a princess, a soldier and a dragon should really make good use of all three.
The challenge grows with every stage
The difficulty gradually increases as you progress, introducing tougher enemies and more demanding boss encounters. This is important because a shooter built around repeated waves of opponents needs to provide a reason to keep improving beyond simply reaching the next screen. Larger threats demand more attention, while bosses offer a change of pace from the regular groups of creatures. Learning their attack patterns and finding opportunities to sustain an assault give these encounters a stronger sense of purpose.
Boss battles are particularly important to the game’s arcade identity. Smaller enemies can often be dealt with through quick reactions and a healthy supply of ammunition, but larger opponents require a little more patience. Charging in without considering your position is rarely sensible when a boss can punish careless movement. These encounters provide useful milestones throughout the adventure, giving players something substantial to overcome after working through the regular stages.
There is, however, a limit to how much variety this structure can provide. The central loop of entering an area, fighting waves of monsters, collecting useful items and moving towards the next encounter is enjoyable, but it can become familiar over time. The escalating difficulty helps maintain interest, yet more variation in stage objectives and enemy encounters would have given the adventure a stronger sense of progression. Once the basic rhythm has become clear, players will know what to expect from much of the action, even if the creatures themselves become increasingly troublesome.
The busier encounters can also become visually demanding. When numerous enemies are on screen alongside weapon effects and explosions, keeping track of everything can be a challenge. This is an understandable consequence of a game that wants to deliver energetic arcade combat, but there are moments when the action risks becoming a little too hectic. The excitement of clearing a large group is undeniable, although clarity is just as important as spectacle when survival depends on reacting quickly.
Colourful anime presentation
The visual presentation fits the game’s personality well. Its 2D, anime-inspired artwork gives the heroines a recognisable identity, while the fantasy environments provide an appropriate backdrop for the monster-filled adventure. Character portraits and expressive sprites lend Lucia and Yuna some presence beyond their roles as playable combatants, and the colourful presentation prevents repeated battles from feeling unnecessarily gloomy. It does not aim for photorealistic environments or elaborate cinematic spectacle. Instead, it recognises that a bright, energetic style suits its arcade foundations.
Combat effects add plenty of activity to the screen, with muzzle flashes, explosions and special attacks helping each encounter feel suitably lively. The monsters provide a steady stream of targets, while the larger enemies and bosses add visual variety to the action. As mentioned earlier, the effects can occasionally make crowded battles harder to read, but they also contribute to the sense of frantic action that defines the experience. There is an appealing enthusiasm to the presentation, even when the screen becomes a little too busy.
The audio follows a similar approach, supporting the action with energetic music and punchy combat effects. A fast-paced soundtrack is a natural fit for a game built around continuous shooting, helping maintain momentum as players move through successive stages. Gunfire, monster sounds and the impact of special attacks provide the necessary feedback during battles, giving each encounter an appropriately lively atmosphere. It is not an especially elaborate audio experience, but it understands the importance of keeping the action moving.
A straightforward adventure with plenty of arcade charm
What makes Isekai Princess: Monster Siege enjoyable is that it does not overcomplicate its central idea. It takes two heroines with very different backgrounds, places them in a strange fantasy world, and gives them an entertaining collection of weapons with which to fight their way through it. The shop and upgrade systems provide a worthwhile reason to keep collecting money, hidden items add an extra layer to stage exploration, and the dragon’s special attacks offer a welcome helping hand when the monsters become particularly troublesome. There is enough here to encourage players to keep pushing forward, even when the underlying structure becomes familiar.
The story also gives the action a little more meaning than a succession of disconnected shooting galleries. Lucia and Yuna have understandable reasons for wanting to complete their journey, and the promise of a heartfelt ending provides a clear destination. Their shared circumstances create an opportunity for an engaging relationship between two characters who might otherwise have very little in common. The narrative is not especially complicated, but its central themes of friendship, survival and finding your way home are easy to appreciate.
There is room for improvement, particularly in stage variety and keeping busy encounters visually clear. The basic wave-based structure does much of the heavy lifting, and players looking for a more involved action adventure may find the repetition difficult to ignore. Nevertheless, the responsive shooting, character choice, satisfying upgrades and increasingly challenging bosses give the experience a solid foundation. It is the sort of game that understands the appeal of a quick action session while offering enough progression to make another stage feel worthwhile.
Final Verdict
Isekai Princess: Monster Siege is an entertaining little arcade shooter with a wonderfully eccentric premise and two heroines who bring contrasting personalities to its monster-filled adventure. Its shooting is accessible yet enjoyable, the upgrade system gives progression a welcome sense of purpose, and the pet dragon is a charming addition to the action. Repetition and occasional visual clutter prevent it from reaching the heights of the genre’s best, but there is plenty to enjoy for players who appreciate colourful 2D action and straightforward arcade combat. TROOOZE has delivered a game that knows exactly what it wants to be, and its mixture of modern firearms, fantasy monsters and anime storytelling gives it a personality that is difficult to mistake for anything else.
