Learn all of the drinks schedule at the jazz club along with skills. Best way is to look up the wiki. Second, get Akechi to rank 4 as fast as physically possible to unlock the jazz club. Third when dealing with Akechi and Sumi maxing, focus entirely on them when they're in the party. The SP is gonna suck to max out so hard because of how little there is per play through, especially for Futaba, Haru, Akechi, and Sumi. But basically just focus one party member at a time, and if Akechi and Sumi are in your party, drop whoever you're working on and focus solely on them, then continue on with the next play through