Ore wa Gimai ni Uso wo Tsuku ~Chi no Tsunaganai Imouto wo Ore ga Hikitoru Koto ni Shita~New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〜; I Lie to My Stepsister ~I Decided to Take In My Non-Blood-Related Sister~; Lời Nói Dối Dành Cho Cô Em Gái Kế: Tôi Quyết Định Đón Em Gái Không Cùng Huyết Thống Về Sống Cùng

Encouraged by a bad friend, Rokurou Sanjo, a part-timer, starts using a matching app. The person he sent a "Like" to on a drunken impulse was none other than his stepsister, Yuuha, whom he had been estranged from 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...!?