Lost - BNHA

Kai Chisaki became Izuku's everything.

After kidnapping him when he was 12, torturing him for information on his villainous father, and letting him go with the promise of keeping his mouth shut, the young Yakuza ends up ordering Kurono to adopt Izuku for two reasons.

Izuku was quirkless, and despite all of the starvation and torture he was forced to endure, the pre-teen still held some form of kindness towards him.

In the harsh and unforgiving world that Kai lived in, he was more than curious to observe and exploit Izuku's kindness that he saw as an anomaly. And that's precisely what he does as he broke Izuku and built him back up to live for him and what he wanted.

2 years later, he goes too far one night and starts developing a deeper obsession over the teen while also beginning to feel regret. So, in a rash decision that seemed logical at the time, he lets Izuku acquire a quirk and enroll in UA the following year, all to satisfy the small urge for Izuku to be happy.

But what will happen when it's now the second semester of Izuku's first year, and the Shie Hassaikai get arrested due to an anonymous tip-off to their base and Kai's plans?