Ep. 4: Keita reflects on childhood prayers while Ako and Riko recall their first year of junior high school.
Aired on April 26, 2010

4
During school hours, Ako and Riko discuss their first year of junior high, specifically the experience of being separated from Keita for the first time. Their teacher, Yuuzuki Kiryuu, overhears the conversation and becomes concerned about the siblings' situation. After classes conclude, Keita encounters Ako and Riko at a local shrine where they are praying for his success. This meeting triggers a memory of his youth, when he prayed to marry both girls but was informed by his father that polygamy is illegal. Keita then makes his own wish at the shrine before the three siblings head home together.
Episodes
- Ep. 1 · Keita confronts his twin step-sisters' romantic behavior and school interference
- Ep. 2 · Ako helps Keita study with unconventional methods, leading to a penalty kiss and Riko's jealousy.
- Ep. 3 · Keita bans kissing while Riko attempts to make him chocolate treats
- Ep. 4 · Keita reflects on childhood prayers while Ako and Riko recall their first year of junior high school.
- Ep. 5 · Keita accidentally gropes Miharu, leading to suspicion, a library chase, and a locked storage room incident.
- Ep. 6 · Ako and Riko hide their adult shopping trip in Akihabara from Keita
- Ep. 7 · Keita's friends lure him to the pool with an erotic magazine, leading to a wet misunderstanding and strange dreams.
- Ep. 8 · Keita enjoys rare summer festival freedom amid rivalry between Ako and Riko