Clubs

In Japan, from your second playthrough and up, you can join clubs by talking to the girl near the right side of the school courtyard.

Joining clubs can give you a small boost to your stats, exclusive items, and change certain dialogue.

If your Stand is Ocean Blue, The Joykiller, Mr. Big, Specials, Pharoah Sanders, or Adam Ant, your occupation in the post-credits scene may change depending on the club you joined.