Tomodachi No Oneesan to Kage Kya Ga Koi Wo Suruto Do Naru No Ka? (DASH X Bunko) [Light Novel]

[Machine Translation] Reiji Hiramiya, a high school student who calls himself ugly and gloomy, is pranked by his older sister, Sakuya, whenever he goes to visit his best friend's house. She drinks his drink without his permission, suddenly barges in on him in the bathtub, sneaks under the covers in the middle of the night, and so on.... When I asked my best friend what I had done to make him dislike me, he replied, "You... you don't even know. One day, Rage loses a game, and he is forced to play a game with his friend, who is a bit of a jerk. One day, Rage loses a game and asks Sakuya for three wishes. Rage is a little skeptical, but gradually begins to understand Sakuya's true feelings...? This is the story of how a very insensitive boy and an older sister who cannot be honest become a loving couple.

自称ブサイクで陰キャな高校生、平宮レイジは、親友の家に遊びに行くたびに、その姉・サクヤにイタズラを仕掛けられている。飲み物を勝手に飲まれたり、風呂にいきなり乱入されたり、夜中、布団に潜りこまれたり...。なにか嫌われるようなことをしたのかと思い、親友に心当たりを尋ねても「お前...まぁだ気づいてないのか」と訳のわからない反応をされるのみ。ある日ゲームに負けたレイジはサクヤの願い事を三つ聞くことに。訝しみながらも付き合っていたレイジだが、徐々にサクヤの本心がわかってきて...?これは、超鈍感少年と素直になれないお姉さんがラブラブな夫婦になるまでの物語―。