Ore no Imouto ga Konnani Kawaii Wake ga Nai

Synopsis

At school, Manami invites Kyosuke over to her house to try out some sweets made by her family's shop for a Halloween event. One of Kyosuke's friends points out that he and Manami are pretty close, but Kyosuke denies there is anything romantic; however, he admits he would not allow any guy to go out with her. Later at Manami's house, Kyosuke tries out the sweets made by Manami and ends up helping her family prepare for the event; he agrees to spend the night. Manami's grandpa tricks them into sharing the same room that night, which prompts them to talk. Kyosuke reveals to Manami that if he was confessed to, he would reject the confession in order to maintain his peaceful lifestyle. Meanwhile, back at the Kosaka house, Kirino is noticeably frustrated that Kyosuke is staying over at Manami's house.

(Source: Wikipedia)