Saikin, Imouto no Yousu ga Chotto Okashiinda ga.

Synopsis

While sitting and having lunch, Ayaka convinces Mitsuki to look at some school clubs to join. Hiyori's objects as she wants flirt time with Yūya, but concedes to her just looking and not joining. Mitsuki starts with the tennis club, and has Hiyori possess her out of exhaustion. Hiyori does great astonishing the team's captain. Hiypri pops back out and the captain begs Mitsuki to join saying they could make it to Wimbledon but she refuses. A similar thing occurs when she tries out soccer club, Hiyori possesses Mitsuki again and does well. Hiyori gets excited when the team captain offers to go for the world cup. Both are overwhelmed though by all the forms involved which causes Mitsuki in her own body to decline. Mitsuki tries out other clubs with no interest until she gets to the kendo club where upon seeing Yukina, Hiyori gets interested. With Yūya watching them, the two have a match with Hiyori possessing Mitsuki, however the men smells too much for her to stand. Hiyori has Mitsuki go back into her body just as Yukina knocks her out, concerned Yūya runs to her side to find out she is alright. The next one that draws Mitsuki in is the theater club where Neko is rehearsing a play she wrote the scenario for. The play involves Yūya who must choose between his girlfriend played by Neko, or his step-sister played by Moa. In the end he chooses his girlfriend who asks to marry him, but at the last minute she backs out saying he should go with the person who he is truly in love with. A new bride comes on stage who isn't Moa but Mitsuki who took her role and says to Yūya "Don't fawn over someone who isn't your little sister". Moa who is tied up runs back up on stage to try to reclaim her role but trips on Mitsuki causing the back of her dress to rip, exposing her backside. After screaming she wakes up relieved it was a dream only to find that she is still dreaming. After another False awakening and awake for real now, Mitsuki gets a text from Ayaka telling her not to worry about what happened at school which causes a shocked look on her face.

(Source: Wikipedia)