The person that got wacked was the stalker right but was he the coach or the teacher who payed the dad
And was the teacher paying the dad to hit sakura just because he was lonely
the guy with the long hair is just some women who picked him up but had her breasts removed which is why he doesn't have a penis (vagina) also the dad was just a dick who beat his kid the money probably came after like the teacher noticed the bruises since he was the nurse and black mailed the father and they made an agreement to pay for the sex (all speculations but this is probably how it went down)
I thought that guy with the long hair was the stalker at first but he turned out to be the boss as well as his transgender guardian