Ijustwannadieinpeace's manga / #omegaverse(187)

Kouguu no Omega

Complete | tsuyuhisa fumi | 2019 released

Age gap is a bit weird and uncomfortable because they met when the ML was a child and the MC was an adult, but there was no grooming. They knew each other for about a month before the ML was "killed" and they spent the next 7/8 years apart. It still feels awkward, but nothing is technically wrong with it.