Imasugu Oniichan Ni Imouto Datte Iitai!いますぐお兄ちゃんに妹だっていいたい!; いま妹; 现在就想告诉哥哥，我是妹妹!; I wanna say that I'm not your brother right now!; I Want to Say to my Older Brother That I'm His Younger Sister Now!; Ima Sugu Oniichan ni Imouto da tte Iitai!; Imaimo; Imasugu Onii-chan ni Imouto da tte Iitai!; Imasugu Onii-chan ni Imouto Datte Iitai!

Rikuto had a new younger brother Ayumu after his father’s remarriage. However, little did he know that Ayumu was actually a girl and it was under her mother’s orders that she pretend to be a boy to him. Every day, his heart beats a little faster around his overly cute brother (sister), while her heart aches in having to hide her true identity from her kind brother. With the arrival of spring, Rikuto and Ayumu begin attending the popular private school Asaoka Academy, with Ayumu dressed up as a girl. As Rikuto becomes friends with his classmates, he notices that they all have something missing. His friend from middle school, Matsuri, has lost sight of what it meant to be a girl. The cool-mannered Mao dresses as a boy even though she is a girl. The extremely shy class rep Kimika wishes to change herself. With Ayumu by his side, he sets out to help them seek out what they are missing.