1The Twins are Three People?
After Kamishiro Maiku recognizes a house on television that appears in a photo that was left to him by his parents, he decides to go live there. Then two girls show up on his door step to move in, claiming to his twins.
2We may be blood relatives
Maiku has the same unusual blue eyes and the same childhood photograph as the girl at his door. They might be related.
3We may be strangers
Maiku has strong feelings about not abandoning a relative, so Miina can stay until they know otherwise.
4Be nice to you
Miina drags Karen along to a job interview so they can help with bills.
5Do you like girls
Karen and Miina begin attending Maiku's school and discover rumors that Maiku doesn't like girls circulate.
6Love Alliance
Maiku worries as the girls attempt to avoid him so they don't have to discuss their changing feelings.
7Making memories
After winning the grand prize in a lottery, Maiku, Miina and Karen head to the beach.
8Love should be honest
Maiku learns the truth of Shimazaki's sexuality. Shimazaki reunites with Tsubaki, whom he was previously in love with.
9Don't Get in Our Way
On a beautiful day, the three head to the mall, but end up getting lost from each other.
10We'd like to run again
Maiku and Karen learn of Miina's past. Karen then find out that the picture of Maiku and one of the girls was taken at a different angle.
11We want to tell you we like you
Karen goes on a date with Maiku before telling the others that they're siblings.
12Three People Twins
Miina runs away, twice. But Maiku won't let her go so easily.
13The Summer Never Ends (OVA)
Two weeks after resolving their dilemma, Karen is obsessed with her newfound brother. Miina also craves attention. Maiku tries to get his work done on a camping trip.