My Mysterious Girlfriend (私の謎のガールフレンドX)

Yuichi is just a regular high school boy but all of that changes when a girl, mysterious girl changes his life forever. Her name is Hiro Murukawa. Yuichi and Hiro eventually start dating when she tell him that he is her loved one, and as she walks up to him to give him a hug she falls towards him and kisses him. Hiro apparently liked it. So Yuichi decides that they should start dating because it was his job to become her loved one and to fulfill their light and their cherry blossom tree. As they date they both find out secrets about each other and also their friends. Also Hiro ends up finding out that her boyfriend she had to leave because she was moving to a different school is at the same school as her. Now Yuichi has a competition. Will he be able to keep Hiro or will she be able to give up her crush.