Developer: Dot Kobo
Size: 105 MB
As far as I could understand, it's the usual "Heroes vs. Demons" kind of story, in which can end with bad endings for the.. female companions? For your sister? Since in the beginning our protagonist gets called "Onii-chan" - unless it's not the true, but another "kind of". But either way, is that kind of game that you can rescue and then bad things happens after a set amount of "time" if you don't hurry, I suppose.