Really hard to pick a favorite track because all the tracks are different and just as good. Koshicollection use hentai sounding orgasms in the music and while that may turn some people away it's structured in a way that is actually musically pleasing. Give it a listen for something completely unique (but you might want to wear headphones) p.s. I like koshicollection vol.1 more :^) but each are great in their own way and would kill to hear more