Hello! I've been trying to remember the name of two mangas I read a long time ago.

The first one was set into a world where everyone is some kind of NPC-like machine except for a black haired girl and the MC. Later on is revealed the MC is also a robot I guess (I'm not sure about that).

The second manga was about a war between an obsessive siscon guy vs some girl (I don't remember much about her) but if I'm not mistaken, she sends an agent to the past with the mission to somehow turn him away from being obsessed by his sister.

The first one sounds like Classmate, Kamimura Yuuka wa Kou Itta.

That's the one! Thank you very much sir 😀