第 4 集: Keita回憶兒時的祈願，Ako與Riko則回想起國中的第一年。

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While Keita studies at school, Ako and Riko reminisce about their first year of junior high - the first time they were apart from Keita. Meanwhile, their teacher, Yuuzuki Kiryuu, eavesdrops on their discussions and begins to worry about what is going on with them. After studying, Keita runs into Ako and Riko at the local shrine, where they were praying for his success. He remembers when he was young and prayed to marry both Ako and Riko, only to be told by his father that polygamy is illegal. Keita makes his wish and the three siblings return home together. (Source: Wikipedia)