I Lie to My Stepsister: I Decided to Take In My Unrelated Younger Sister

Sanjou Rokuro is an ordinary part-time worker whose life takes an unexpected turn after a night of drinking. Egged on by his mischievous friend, he impulsively downloads a dating app and ends up matching with none other than his own stepsister, Sanjou Yuuha. Neither reveals their true identity, and through their anonymous messages, Rokuro discovers that the high school student has stopped attending classes altogether. Concerned by her absence, Rokuro visits Yuuha one sweltering afternoon and quickly realizes she is enduring severe difficulties at home. When she reaches out for help, he makes the bold decision to take her in and let her live with him. However, Rokuro carries his own heavy burdens, having been disowned by his father just before graduating from high school. Now sharing a home, their daily lives are built upon carefully constructed lies as both desperately try to protect their hidden truths and painful pasts. As they navigate this fragile arrangement, an unconventional romantic comedy between a stepbrother and stepsister quietly begins.