Looking For A Manga and I Cant Remember The Name

Ok so i was reading this manga where this guy has a Automaton that looks like a normal girl and she likes him a lot and says she's his wife to people they meet. The girl is the best creation of a automaton builder. And then he goes to a school for people with automatons and he meets a girl who is kinda cold and has a dragon automaton. sorry its not that much info but i cant remember that much.

Thanks

He has the nickname "Second Last" because he got the second to last place in grades

Could be wrong..but I wonder if it is Kikou Shoujo wa Kizutsukanai

maybe CHOBITS or Video Girl Ai？````````````````````````````````````````````````` ```

i think you are looking for unbreakable machine doll