
Ok it's been so long that I have no idea who's who or what's going on, can someone give me a short summary?

The FL (Mizuha) likes her older tutor (Ren-kun/black haired guy). Who has now said that they can't hangout for some reason. Her classmate (Chiaki, the ML, who sits next to her) likes her. Not much has happened other than: Chiaki had confessed to Mizuha, who had rejected him, Chiaki's friends don't want Chiaki to date anyone, because they made a pact to stay single, and at this moment Chiaki and Mizuha are just friends and plan on playing the piano together for a school event.
This whole story has become- Oh no you are marrying the wrong person! BOOM! Time travel!
Now go marry your adoptive brother
sigh... I wish the reason she came back was actually for familial bond, with her romantic relationship with Johann as a side-development.
That would have been really wholesome and fluffy