Look I don't know what it is. But I guess he was very young like 14 or 15 at the time. At that time he was scared and that maybe. Was his Grandpa or something. He couldn't save her and he regret that but that doesn't mean that makes him worse then that grandpa. He is not a reaper he was a kid. And not all of us always take the right choice at right time. And this. Manga is super shit. Still I will give it another chance. See y'all next chapter