
they're past lives is so tragic but the real villain was past life kaito and the girl like KAITO u could have ran to him so many present reincarnations of yuuma SUFFERED because you didn't clear up the misunderstanding all yuumas never got the chance to say I loves you to they're kaitos all because you decided to be a coward and not clear it up I feel so sad for those yuumas

Yep, Touma's resentment and Hayato's regret fucked up the reincarnation cycle. It seems as if this story follows the concept of karmic attachments from past lives. That is probably why all their past died young looking at their appearance, Kaito's past lives as well. Yuuma and Kaito broke the suffering-filled cycle.
Honestly, after rereading the chapter, the girl's family has ties connected to the Yazuka (which was very powerful back then) and threatened to enlist their help and bankrupt Touma's family. He should have told Touma the situation instead of avoiding him and writing a letter.
this manga literally hitting all the spots for me a genderfluid mc and they're malewife!?!? SIGN ME UP only complaint I have is chap 7 should have more of them just being together