Sakitani Kinenkan

Sakitani Kinenkan is a bed and breakfast huge building where a part of the 9th Grade Class 3 stayed a night during their summer trip. This location is located in the forest and was first seen in episode 10. The owners of the Sakitani Kinenkan are Keiko Numata and Kensaku Numata, Ikuo Takabayashi 's grandparents. This is one of the most important locations of the series, having a great impact. During the night, Keiko Numata has gone insane, set the building on fire, killed her husband and stabbed Manabu. Here died most of the students ( Izumi Akazawa, Takako Sugiura , Yumi Ogura , Aki Matsui , Kyouko Kaneki , Tomohiko Kazami, Kenzou Kawahori, Makoto Ouji  ) and others adults ( Keiko Numata, Kensaku Numata, Ms. Mikami ).

How the students shared the rooms
Mei Misaki alone

Kouichi Sakakibara and Yuuya Mochizuki

Izumi Akazawa and Takako Sugiura

Naoya Teshigawara and Tomohiko Kazami

Matsuko Arita and Sayuri Kakinuma

Aki Matsui and Kyouko Kaneki

Yukito Tsujii and Kenzou Kawahori

San Watanabe and Yumi Ogura

Makoto Ouji and Noboru Saruta

Daisuke Wakui and Manabu Maejima

How the teachers shared the rooms
Tatsuji Chibiki alone

Ms. Mikami alone

Trivia

 * In the novel, only fourteen students of the remaining 28 attend the school trip to Sakitani Kinenkan (in the anime, 19 students attend). Of those students in the novel, five die (Izumi Akazawa, Manabu Maejima, Shigeki Yonemura, Takako Sugiura, Junta Nakao).
 * In the novel, only five female students attend the school trip and Mei gets her own room.
 * A scene omitted from the novel is when Kouichi is going to Mei's room, he notices from a window a figure going to a shed outside. He'll later realize it is Keiko Numata gathering things to set the fire.
 * In the novel, the fire spreads quickly and there is a lot of chaos with the students getting out. In the anime, even though there is a fire, it's a low priority to increase the death counts.
 * In the novel, no students were killed while escaping from the building. There were some injuries.
 * In the manga very few students died, Manabu, Takako, Shigeki and Nakao died but that was because of the fire, and not Keiko Numata.