Yuki Yuna is a Hero -Washio Sumi Chapter--/Hero Chapter

The TV anime “Yuki Yuna is a Hero – Sumi Washio’s Chapter / The Hero’s Chapter” is a two-part story which bookends the first TV anime “Yuki Yuna is a Hero.” “Sumi Washio’s Chapter” is the prequel and “The Hero’s Chapter” tells the tale of what happens afterwards.

Yuki Yuna is a Hero / Heartwarming - TV Tropes

Why I still don't ship YunaXTogo even though it's canon, AKA Sumi/TogoXSonoko support post number two

YuYuYu News (@YukiYunaNews) / X

2008 FALL CATALOG BOOK.indb - Right Stuf

Reddit - Dive into anything

Sentinel System, Wiki

Friendly Neighborhood Imp: 2020

Anime Trending - Here is the Top 20 Anime of the Week #2 of the Fall 2017 Anime Season! Fall 2017 Polls are OPEN! Top Anime: Character Poll: Couple/Ship Poll

Doctorkev's Thoughts on the Summer 2022 Anime Season: Sequels and Ongoing Shows, by DoctorKev, AniTAY-Official

Tienda Ultra Tokyo Connection

WaSuYu 4komas Heroes March Song

Yuuki Yuuna wa Yuusha de Aru yuyuyu - Lily and Yuzuki are finally summoned to the Hero Club in YuYuYui! And as expected, Togo and Sumi had some slight suspicion on Lily