Akitsu definitely my favourite now. She's currently the only source of challenge for the MC. Sadly he hasn't really lived up to that challenge.
Hoping the MC will actually have feelings for Hiyori. Other than getting Akitsu's approval, I think it'll represent some growth in him. Can't really depend on the dungeon for that, but hopefully the sex part can do something about it.
No more item like the bell please, the others are just fine.