I Lie to My Stepsister: I Decided to Take In My Non-Blood-Related Sister

Encouraged by a bad friend, Rokurou Sanjou, a part-timer, starts using a matching app. The person to whom he sent a "like" to on a drunken impulse was none other than his stepsister, Yuuha, from whom he had been estranged ever since he was kicked out of the house two years ago. However, for some reason, he actually ends up "matching" with her!! Driven by a momentary whim, Rokuro begins exchanging messages with her while pretending to be a complete stranger, but...!? (Source: Shueisha, translated)