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ZONE games aren't really games, but sweet Jesus does 4chan love them and each one is well-made. Another Illusion game, so it's good stuff as usual.
You can create a classroom with 25 students complete customizable (the male customizations are really poor compared to the female ones) and then see how they react with each other.
Contains dungeons filled with enemies, secret rooms, weapon upgrades, and bosses.
Different artists worked on the visual art, so they're not all so awesome; not like a leech-girl could look better anyway.
There is also a worthy sequel, and the finale released.
It should be noted that as of now, many foreign countries have been IP blocked and none of the online functions will work at all.
You will need a VPN if you want to play online (which is really the point of the game) Lastly, it does not follow regular installation methods.
Original name is かりんとあそぼ！, also remember to set your PC on Japanese Uni-Code. Very good gameplay, with collectible skills and weapons and some very hard jumps.