My Yandere Boyfriend (Beyblade Burst Surge)

Lain Valhalla's parents suspected something about him is different than other normal kids and his parents abused him for disobeying their rules and they except him to be a normal average child who isn't like crazy people, then he's parents find out he was a yandere child so they abused him again as he got sick of it.

So when Lain is old enough he had enough of his parents and runs away from home and he started a new life somewhere else then when he met Shu Kurenai his bladding coach, then he was obsessed of growing his flare further after the day of the Ultimate Tag Series has arrived he and Shu Kurenai teamed up.

At the last day of the match Lain Valhalla has his eyes locked on a girl who is Wakiya's assistant which apparently the girl is younger than Lain and Wakiya, Lain is in love with the girl and planning to kidnapping her and may do whatever it takes to make her love him back and will not hesitate to kill anyone who touch her or might take her away from him.