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Contains one main story and two side stories.
Main story:
Yue resides alone with her 27-year-old stepfather, Kouki. She's in a relationship with a boy her own age... yet she can't help but think about Kouki. Could it be love...!?
Side story 1: Koukando Equals.
Side story 2: Diamond.
(Source: ShoujoMagic)