The main heroine of this work, Tsubaki Uruto, is the new partner of the protagonist, Mamoru Ichijo, and one of the Magia Ritter who fights against monsters and demons. She had continued to harbor a stylish love for the protagonist, but finally, she and the protagonist were to be united.

However, her daily life was suddenly changed by the demon, Lambda, who appeared out of nowhere. She finds herself in a fierce battle. In order to get back the person she loves, she releases her hidden power, the "Enge no Chi" (Blood of Lustrous Flowers), but after the battle, she is tormented by the "Indo" (Lust), a recoil from using her magic, and ends up having sex with Yajuro. However, a deep pleasure she had never known awaited her there.

Eventually, she realizes. That her body has changed into "a body that can only be satisfied by Yajuro's sex."

This is a story of cuckoldry, continuing from the previous work, where she falls into a "body that cannot be satisfied by her beloved boyfriend."