The series that follows Onegai Teacher, this show isn't really a sequel, but some of the characters from Onegai Teacher do show up in this series. Most notably Mizuho and Ichigo. Onegai Twins is a story about three young adults who return to the home of their birth to find out about their past. The only problem is that the past which is only seen through an old photograph only shows two people who appear to be related. From that point on, the story follows what is going to happen between Maiku, Karen, and Miina as they try to find out about their lost past.