Minoru Kusunoki was raised by his aunt, Tomoe Kusunoki, the twin sister of his biological mother, in an overprotective environment that restricted his interactions with the opposite sex. This upbringing resulted in social inexperience and limited exposure to relationships.

A pivotal moment occurred when Minoru received an accidental email from a woman named Akane. He developed a sexual relationship with her while sensing a vague familiarity, yet remained unaware of her identity.

Upon returning home after meeting Akane, Minoru noticed a strong physical resemblance between her and Tomoe. This led to the revelation that Akane was his biological mother and Tomoe's twin sister, placing Minoru within a forbidden relationship dynamic involving both twins.

The discovery caused emotional turmoil for Minoru, manifesting as confusion and anger over his disrupted understanding of family and identity. His feelings gradually evolved into acceptance as he adapted to the unconventional family structure. He ultimately acknowledged both Tomoe, his aunt and adoptive mother, and Akane, his biological mother, as maternal figures, forming a triad relationship dynamic.