An ordinary salaryman, Yudai Watase, receives an unexpected visit from his distant relative, Hiyuki Takamura, begging, "Let me crash at your place!"
Unable to leave a helpless young runaway out in the cold after fleeing family drama, Yudai opens his doors to her. Sharing the rhythm of daily life under one roof, warmth turns to affection, and affection soon blooms into passion as they surrender their bodies to one another. While the upstanding Yudai tries to figure out how to help her reconcile with her family, Hiyuki has no intention of going back. Desperate to repay Yudai for his kindness, she turns to sugar dating. Eager to earn cash and give Yudai the comfortable life he deserves, she catches the eye of a sleazy, flashy stranger.

Homare Sakaide, a wealthy, self-styled influencer. He lays out a tormenting proposal: a live "NTR Show" testing if Hiyuki can endure an entire month without giving in to illicit sex. Hiyuki has no choice but to open her thighs for the one she loves. Yudai has no choice but to agree, thinking only of her future. Before long, their intertwined hearts begin to give birth to a dark "lust" that strays far from their original goal――