Jakotsuno (蛇骨野) is a character that has yet to formally appear in anything. She is a human girl and appears to go to the same school as Eruko.
Jakotsuno has fair skin and long, black flowing hair that seems to stop at her ankles. Her eyes are black with white pupils, having a light pink blush underneath. She has rounded glasses that are slightly covered by the blush. She wears a sailor fuku that consists of black and white top that holds a white ribbon on the collar with a black center, in front of a light toned gray sweater with long sleeves. As part of her school uniform, she also wears a black skirt. She wears baggy white knee socks and black loafers.
Jakotsuno is a dreamer that is in love with the idea of being in love.
Not much is known about her.
Up to this day, Jakotsuno has only appeared in some of Deep-Sea Prisoner's Illustrations.
Niramigawa is one of Jakotsuno's classmates. She is also Jakotsuno's best friend.
Eruko is possibly one of Jakotsuno's classmates.
Sabaki is possibly one of Jakotsuno's classmates.
Hitomi is possibly one of Jakotsuno's classmates.
- Her name means, "Wild Snake Bones / Field of Snake Bones."