@Alexis_saige22
They were going to the same school and at some point became friends, or rather he liked her, but they kept that a secret from others, she didn't really have friends at school There's something about her parents being strict, but not much. After she started getting bullied he didn't do anything, he let that happen and at the very end he laughed at her. After that they never meet again.
Masaki starts following an idol, I guess he falls in love with her, at some point she moves in the apartment next to his, he thinks it's a blessing, he couldn't be more wrong.
Then the story happens. Apparently all she did was out of revenge, because she blames him for everything.
Since she cuts her hair I guess she's done with him now.
Also these scissors will end up in his throat or something, won't they?