In Zetsuen no Tempest, a bunch of guys were guessing to reasons why someone (Yoshino) might hide his girlfriend, and writing them on a whiteboard. One of the reasons that came up was that his gf might be an elementary schooler. When this was written (see attached pic), it was written as "ロリヰタコンプレックス

the god revives him in his own body and then the mc saves a black cat(who is a lion spirit) he then starts to help his female classmate who is some sort of exorcist, he fights for her clan in a tournament among exorcist clans, where he wears a mask in order to hide his identity

The girl marries an older man who trains her to take over his estate because he is dying. She is not the children's biological mother. He leaves her with four children, who, through many misunderstandings, end up hating her. Upon the wedding day of the oldest boy, who will also inherit the title,...

I'm looking for these mangas I read a while back. The first one was where a whole class was summoned and everyone except the MC got Sold off to nobles because he was weak and eventually the MC saved this girl from where she was sold off to. I'm not sure if this is the same Isekai manga, but the M...