Hinako, a shy schoolgirl, secretly harbors feelings for her college-aged neighbor, Seika. When she discovers that Seika uses a private social media account to seek out women, Hinako creates a hidden profile and reaches out via direct message. But Seika already knows everything—and invites Hinako into a world of forbidden intimacy. What begins as a game of seduction turns into an intense and revealing experience for Hinako.