Omakase! Trouble Angel

Kazuma has been living in an orphanage. He doesn't know why he came there and where his parents are. But he is not all alone. He lives with two girls, Haruna and Akiu, there. All of them don't know how they came and if they are relatives or not. The only fact they know is they live like a real family. However, Haruna grew up and left the orphanage and Akiu also left the orphanage. They kept in touch for a while but gradually they lost in touch with one another. Several years have passed... The story starts just when Kazuma is about to leave the orphanage.