俺は義妹に嘘をつく ～血の繋がらない妹を俺が引き取ることにした～

Sanjou Rokuro, a part-time worker was persuaded by his mischievous friend to impulsively download a dating app one night while drunk. To his surprise, he matched with Sanjou Yuuha, his stepsister. They began exchanging messages, each pretending to be someone else, and Rokuro soon learned that Yuuha, a high school student, had stopped attending classes. One sweltering afternoon, Rokuro decided to check on Yuuha. Upon seeing her again, he realized that she was going through a difficult time at home…!? Yuuha reached out for help, and Rokuro decided to take her in and have her live with him! However, Rokuro has a troubled past, too: just before graduating high school, his father had disowned him. Their daily life is built on carefully constructed lies, both trying to protect a hidden truth. The romantic comedy between a stepbrother and stepsister begins! (Source: DASH X Bunko, Translated)