A Sister's All You Need - Specials
1 - Chihiro's All You Need
Air Date: September 10, 2017
Itsuki is frustrated after his manuscript gets rejected by his editor. He hangs out at home with Chihiro (his younger “brother”), Miyako, Nayuta, and Haruto. Light banter, comedic rejection & friendship moments.
2 - Nayuta's All You Need
Air Date: October 9, 2017
Nayuta and Miyako reflect on how they met Itsuki and how their friendship developed. Some cute or comedic character build‑up.
3 - Miyako's All You Need
Air Date: October 23, 2017
Itsuki travels for inspiration with Nayuta and Miyako, then is dragged along by some other friends (like illustrator Setsuna) to places like Okinawa, Hokkaido. Small adventure vibes.
4 - Haruto's All You Need
Air Date: October 30, 2017
After work/manuscripts are submitted, the friends gather for a board game session. Itsuki reveals his feelings for Nayuta to Haruto (not knowing she heard). Ends with a reveal that one of his novels is going to be adapted into an anime.
5 - Kaiko's All You Need
Air Date: December 3, 2017
Kaiko is introduced in the regular anime series during episode 6, "Having Your Media Developments Go Well Is All You Need." In this episode, Itsuki meets the refined manga artist to discuss his work, only to discover she shares his love for little sisters.
6 - Ashley's All You Need
Air Date: December 10, 2017
The special features super-deformed, or chibi, versions of the characters in a two-minute episode.
7 - Toki's All You Need
Air Date: January 26, 2018
The anime series itself is a comedy about a novelist, Itsuki Hashima, whose life is dominated by his obsession with "little sisters". The special episode likely focuses on one of the supporting characters, Toki.
8 - Setsuna's All You Need
Air Date: March 23, 2018
The special episode focuses on the character Setsuna and is a short, 2-minute installment.