i seriously love all of them but if i had to rank, probably
1) Petal’s Resolution (even without kohaku/kohaai bias this would be my favorite i’m just a huge fan of this type of song… like the mix of instruments?! the vocals?!?! the LYRICS? insane… i feel insane)
2) Thrill Addict (it’s so catchy and i loop it a lot)
3) Shishen Hold me tight (ITS SO GOOD GODDAMN IT)
4) Yummy Tummy Love (THIS IS SO GOOD TOO IT MAKES ME SMILE SO MUCH)

sorry im biased towards kohaku… his solo is seriously my fav now though