Ima Sugu Onii-chan ni Imouto da tte Iitai!

This all-ages debut from fairys, sister company of sprite, takes place before the main events of Koi to Senkyo to Chocolate. Rikuto gains a new younger brother, Ayumu, after his father's remarriage. Unbeknownst to him, Ayumu is actually his sister, acting under her mother's orders to hide her true identity. Each day, Rikuto's heart races around his overly cute 'little brother', while Ayumu aches to keep her secret from her kind sibling. As spring arrives, they enroll in the prestigious Asaoka Academy, with Ayumu now dressed as a girl. Making friends, Rikuto notices each has something missing: his middle school friend Matsuri loses sight of what it means to be a girl; cool-tempered Mao dresses as a boy despite being female; and shy class rep Kimika longs to change. With Ayumu by his side, Rikuto sets out to help them find what they lack.