Kanojo wa Hanayome Kouhosei?

Shinji's parents have died in an accident years ago, so he has grown up in an orphanage. Now, years later, he gets approached by a maid with the name Zero who claims that Shinji's father was the only son of a millionaire. His grandfather now intends Shinji to inherit his business. Shinji doesn't feel much for inheriting a company from a person he doesn't know, especially since he has plans for his own life and wants to eventually marry his childhood friend Sae.