He's not really yandere tho, he's just intense when it comes to love...I've seen worse so I don't understand why people are worried that he's gonna kill her or something. Boi even said he would just disappear if she never fell in love with him. Honestly I just see him as someone who lacks friends because people keep their distance from him (admiring from afar or keeping away because of his cold front) and is trying really hard(albeit, a lil too hard) to find someone to love him. He goes too far, but its only detrimental to him more than it is for his partner. Hotaru teaches him new things about life and relationships outside of the romantic kind, and he teaches her about romantic love. They both grow(even tho he takes a little longer to, mainly because its hard for him to open up.) That's what the comic is about. They grow as a couple, and their worlds are expanded as they try new things.