Well here is the thing I only played 4 games by FuRyu and I liked em all for some reason but here is a mini review in each game (aside from alliance alive)
Caligula effect 1 overdose :The game had an enormous potential but alas the execution wasn't really there.The game revolves around a group of people stuck in a place called Mobius .Mobius is basically a place where people have their dreams fulfilled but it's not the real world and people there doesn't even realize that they are in a "dream". The protagonist and his party however does realize that and they try everything they can to return to the real world knowing that they will have to sacrifice their happiness in Mobius .The antagonists however are people that still realize that they live in a false reality but are willing to stay arguing that their goals cannot be fulfilled outside of Mobius.Mobuis is basically run by a JP idol that aside from making people happy by giving them their best lives she sings for for them. And these songs are composed by the antagonists with lyrics basically talking about their traumas or regret in real world which is kinda creative.btw you can join the musicians and have a boss music too just saying(also you play both sides at the same time btw ).the battles system is kinda like composing music too but it's too long to just talk about here but it's very unique.the main critique of caligula effect is .it has psp graphics (though it's originally made in vita )
The horrible dungeon scheme ,the lackluster animations,and the shitty sidequest system that I for one didn't even look for ,like I never played a side quest in caligula.if you happen to play the game chose hard since it's very easy and hard is kinda the normal here.
Caligula 2 : is the sequel it's basically the same thing but more optimized ,better side quests ,better graphics ,better dungeons ,better battle system ,however you cannot be musician so no exclusive boss music for you
Monark :I forgot a good chunck of the game so I'm just gonna tell you what I remember .you start the game by taking a personality test that affect which sin for the 7 deadly sin you're aligned too (the 7 deadly sins here is basically the character class I'm jrpg like fighter ,healer etc) the result you get will decide which character class u obtain as companion after that the school u in suddenly got closed by a big barrier (not sure why ) and then u get teleported in another world to fight some monsters where u struggler to fight them until you make a contact with the monark of vanity.the first part of the game is basically defeating the other monarks (the 7 deadly sins ) and the other part is basically trying to solve the overall mystery . Oh yeah I remember now to go the other world u have to call a certain number each number takes you to certain place so there is that.one.kf then critics of most reviews is that monark is grindy BUT THE DON'T EVEN KNOW THE LATTER MECHANIC.you just need a number that takes you to certain battlefield where they gives you ton of exp, there is also a number that gives you materials too .but the reviews go grind the normal battles which is stupid thing to do. Anyways the battle system of monark is very entertaining and hell you can experiment a lot with the protagonist ability .it can make fight easier it make you lost
instantly.my sole critique of the game is that it has your typical Furyu vita graphics and that's it tbh it a quite good game