Yayoiso

Yayoiso (lit. "Evening Grass") is the pen name of the author of ReLIFE (Webcomic). Her real name, age, and looks are not made public, although she does hold autograph sessions with fans (photos of autograph events have her face redacted).

Her serialized works include ReLIFE and Yowamushi Resound (リザウンド).

See also:

Regarding her pen name

 * On her twitter account, her pen name is currently stylized as "YoyoiSo".
 * On her old homepage (last updated at the end of 2013, shortly after she started working on ReLIFE), her pen name is stylized as "Yoyoi-Sou".

On her old homepage she said that "even though 夜宵草 is a single entity, if you need to split it, split it as 夜宵/草 (Yayoi/Sou) and call me そうさん (Sou-san)".

Hence we can call her Ms. Grass.