This was perfect 10/5. I love absolutely everything about this. It's not rushed, there's a reason why the characters act the way they do, there's no rape or assult or anything like that. It manages to really pull you in and I think this would be relatable to everyone especially if you have divorced parents or family drama. I also loved how they have actual personalities and how patient Masumi was with Sensei's feelings. Read it.
Sensei, Mou Dame Desu