(A Sister’s All You Need: Side Story – Becoming a Sister’s All I Need!) spinoff manga of Yomi Hirasaka’s A Sister’s All You Need (Imōto Sae Ireba Ii.) light novel series as ending with the third volume.
Yen Press licensed the novel series under the title A Sister’s All You Need.
The spinoff manga focuses on Nayuta Kani, who falls in love with novel writer Itsuki Hashima through his literature.
Hirasaka launched the novel series in 2015, with illustrations by Kantoku (The “Hentai” Prince and the Stony Cat.).