Source is from the author’s twitter.
Mangadex page for the series.
[Art] Nagisa Eating Onigiri by "Mane Mane Nichi Nichi" Author Yamamoto Souichirou
Submitted 1 year ago by wjs018@ani.social to manga@ani.social
https://ani.social/pictrs/image/02d7c697-52df-4822-9772-48c36739203e.webp