I was confused about the seme... wasn't he the one that cursed him??

No? That was a different student.

Nope, it was a different student. It's because Mishima-sensei's most characters look all same that you mixed it up.

no, the student who cursed him saw him helping Akane, and fell in love with him while akane fell in love because of the same reason, but was the one sensei helped ^^