Caught in a wave of jealousy fueled by a longing for maternal affection after growing up in a fractured family unit—and constantly envying her best friend Yuta—the protagonist finds his obsession centered entirely on Hikari-san. With her stunning looks and captivating curves rivaling any mother figure he craves to be close to permanently. The tension explodes when he stumbles upon her in the bathtub; witnessing her milky white skin glistening as she masturbates to ecstasy sends his erection soaring instantly. Unable to contain himself while pleasuring himself outside the bathwater’s embrace, he boldly demands that Hikari-san join him to finish what he started.
Initially overwhelmed with embarrassment after this brazen encounter, he retreats into a quiet admirer role from afar. However, fate intervenes when Hikari-san falls ill. Since Yuta is away at university in Tokyo, the protagonist rushes to check on her, and mere proximity ignites the primal beast within him. He loses all control, finally succumbing to desire by taking advantage of his best friend's gorgeous mother. This initial act shatters the boundary between friend and object of lust.
The experience proves too electrifying to stop. The pair begins an intense cycle of passionate encounters, moving beyond tentative acceptance into full surrender. Though she initially resists his advances, Hikari-san gradually melts under his attentions, eventually granting him permission to become an intimate part of her life forevermore. If you love forbidden romance mixed with raw sexual tension, this depiction of best friend's mom sex is must-watch viewing.