Kamishiro Maiku, was a orphan at a very young age, and the only thing that links him to his past is a vague photograph depicting him and one other in a kiddie pool with a big house in the background. Now in high school, Maiku was able to leave the orphanage he was in, took up a job as a programmer, and rented the very house that was in the photo in the hopes of reclaiming something of his memories.
One day, two girls show up at his doorstep, each bearing the same photo and insisting that they could be his relatives. What's a guy going to do in this situation? Who is the relative and who is the stranger?