Otonashi Meru is student no. 16 of class 2-F. Meru is a quiet girl who can only communicate with others via texting and e-mail. However, the contents of her messages are poisonous. When provoked after being stuck in an area with no cellphone service, she starts babbling in an incredibly dark language (the kind used during demonic possession). It is revealed that Meru stopped talking after being teased about her voice in elementary school. Her family name, Otonashi, means "soundless", while Meru is derived from the Japanese loan word for "mail". Her e-mail address is firstname.lastname@example.org, where hazukashi gariyasan means "shy girl".
|Characters of 91 Days|
| Tarou Sekiutsu | Kafuka Fuura | Manami Ookusa | Kanako Oora | Meru Otonashi | Ai Kaga | Chiri Kitsu|
Kaere Kimura | Abiru Kobushi | Kiri Komori | Matoi Tsunetsuki | Miko Nezu | Nami Hitou | Harumi Fujiyoshi
Madoka Marui | Shouko Maruuchi | Mayo Mitama | Rin Itoshiki | Kotonon