《闪乱忍忍忍者大战海王星 -少女们的响艳-》是由Idea Factory与Tamsoft开发、Compile Heart发行的《海王星系列》ARPG作品。该作是《海王星系列》与《闪乱神乐》系列的联动作品，此外PS2游戏《忍道戒》中的角色“鸦之业”也化身为美少女参战。所有忍者聚集的“幻影梦忍界”-各国大名都在为夺取天下展开激烈争夺，其中坐拥两大忍者流派的两个大国之间更是火花四溅。最擅长忍术“指令术式”的流派——魂波流（海王星）。最擅长忍术“反射术式”的流派——刃仁破流（闪乱神乐）。两大阵营争夺霸权。突然，一个操纵“射击术式”的神秘机械忍者军团发动了袭击。机械忍者军团迅速占领了一个小国，其首领，“杨完迦”，向全世界宣告：“决定世界最强流派的‘超NINJA大战’开始！”
作为两个系列的联动作品，系列玩家看见这个游戏也感觉颇为有趣，作为闪乱神乐全成就玩家和约战粉丝来说，闪乱忍忍忍者大战海王星真是一部相当有意思的作品，Tsunako是约战的画师也是本游戏的主美，所以玩过地雷社旗下Date A Live的玩家，应该对画风也是相当熟悉和喜欢。而作为闪乱神乐系列粉丝的我见到飞鸟，焰，雪泉和雅绯也甚是感动。在没有闪乱神乐单机新作品的当下，闪乱忍忍忍大战海王星，无疑是最棒的闪乱神乐代餐，更细致的建模与更好的场景，都让我这个老玩家狠狠心动。
以气力槽为核心进行疾行与闪避，消耗气力槽还能发动“忍术技能”。在选择技能时画面会进入慢动作，可以冷静下来选择技能。在进入战斗前的配置界面可以各自配置喜欢的技能。忍术技能发动后再次发动忍术技能，就能触发连锁效果“忍术爆发”，使忍术技能的效果增强。有“初”→“贰”→“参”→“终”最高至四阶段，连续发动技能可以获得连锁效果。与敌人战斗还可以增加EX槽，积满时就能发动的必杀技，给敌人造成大量伤害。还有可在任意时间发动次数有限的觉醒模式“风林火山驱动”，在发动后会根据“风、林、火、山”的类型短时间内获得对应的效果。最后还有忍具系统，装备的“手里剑”、“苦无”忍具都是远距离攻击的手段，可以加入连段之中。手里剑着重损伤，苦无着重异常状态，两种武器可以随时切换。此外就是可以回血与加buff的各种道具，可以在战斗中使用。
战斗挑战关卡黄泉修炼，关卡内继承血量和风林火山的驱动次数，有的关卡还会对角色能力进行各种限制。乳桃冥想则是游戏内一贯的福利内容？（误），玩家可以自行探索。
总的来说是一款对系列粉丝来说的优秀游戏，系列粉丝外的玩家也可以通过这一款联动游戏来开启对海王星和闪乱神乐系列的兴趣。

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Honestly the only thing I was thinking while playing is why can't we play with untransformed forms bc outfits look great and fan-service should have been better considering it has SENRAN KAGURA in title but whatever that is my only issue with this game still recommend to experience it yourself.

Neptunia x Senran Kagura: Ninja Wars is a visual novel built behind a hack n slash, where you switch between two characters in each mission and cut through waves of enemies. There are ten playable characters in total, each with a unique moveset and special ninja arts that can be chained into combos. You also get buffs, ultimate skills, and different elemental forms that change how your character fights, which adds some variety. Still, the flow of combat can feel slow. Enemies appear in small numbers, attacks have limited range, and animations often lock you in place, leaving you open to damage. Because of that, battles end up being more defensive than expected. On lower difficulties the game becomes almost too easy, but on hard mode it’s more balanced and makes the fights more satisfying.

The story is typical Neptunia spin off material. Lighthearted, filled with typical, familiar humor jokes and fourth-wall breaks. However, the crossover aspect feels underused. Senran Kagura is known for their "interesting" features like clothing break or flashy transformations, but those are missing here. Instead, the game sticks closer to Neptunia’s tone, which some players see as a disappointment and others see as a cleaner focus on the fighting. The characters themselves carry the story with their personalities, but the structure of missions repeats often, with recycled enemies and reused bosses. That lack of variety makes the campaign feel padded. Still, if someone is already invested in the Neptunia universe, this is nothing new. The story mode takes about 10 to 15 hours to finish, with side missions and extra grinding stretching that to around 30 hours if you want everything. The problem is that the content doesn’t expand much. The same maps and enemy types repeat again and again. There are also a few minigames, but nothing substantial to return to.

Visually the game looks better than past Neptunia titles, and on PC the port is surprisingly solid. It supports higher resolutions, mostly stable framerates, and uncapped FPS during gameplay, though there are quirks like frame limits in menus or odd issues with non-standard screen ratios. Compared to older PC releases from the same publisher, this one runs well and feels polished.

In the end, I believe Ninja Wars is one of the better spin offs. It has a pretty straightforward action style with less grinding but it's definitely not worth buying on full price.