Maihime Shirayuki has a laid-back personality and can’t play sports to save her life. She was chosen to be a member of HxEROS because of her hidden eros and became Hxe White, but she lacks confidence because she thinks she doesn’t have any strengths that set her apart. A Kiseichuu appears at the all-girls high school that Maihime goes to, but how will she fight this enemy and its menacing tentacles? Meanwhile, Sora Tenkuji, aka Hxe Blue, has a hobby that she can’t tell anybody about… Kirara finds out about Sora’s secret, and Sora makes Kirara take part in her antics.

Kirara has been suffering from hallucinations where she sees Dark Kirara, the shadow side of her personality, in the form of her childhood self. Dark Kirara says that her purpose for appearing is to make Kirara and Retto into a couple. At first, Kirara does not listen to her meddlesome alter ego, but after seeing Shiko make passes at Retto, she can no longer contain herself. Flustered by the arrival of this unexpected rival, she heads over to the bathtub to find Retto, after Dark Kirara whispers in her ear to make a move…

Retto battles a Kiseichuu and defeats it with ease but is stung by its poison in the process. He doesn’t think much of it, but right after he is stung, a cute weasel escapes from his pants! The enemy he defeated was the Nyotaikachuu, which turns its prey into females when they are stung. The weasel that escaped was the embodiment of Retto’s manhood! If he doesn’t capture it soon, he will irreversibly transform into a woman. Will Retto be able to become a man again?