Told from Rikka's point of view. Rikka
thought her, Saku, Miki, and Yuu were all siblings, but realized the family
is more complicated than that. At 6 years old Rikka’s and Saku’s parents
explain the family tree. Saku already knew, but Rikka was confused. At first
Rikka is upset that Saku's parents aren't hers, but Saku explains they are
family and blood doesn't matter. As it is raining Aoi gives Rikka his umbrella
while she is waiting for Saku. It is implied that Rikka has a crush on Aoi.