A cheerful high school girl who also suffers from insomnia like Ganta. She first discovered the abandoned observatory and made it her sleeping haven, until Ganta came along. 

~!As she and Ganta became closer, she shared to him that she has congenital heart disease which requires monthly examinations, frequent hospitalization, and even surgeries. She was the only other member of the Astronomy Club in her first year, and became the vice-president later in the winter of the same year.!~

~!She started dating Ganta after his confession at the end of their club trip. Initially, she aimed for a university within Ishikawa Prefecture, until she managed to convince her mother to allow her to try for a university in Osaka.!~

Ganta Nakami is a high school student who suffers from insomnia. One day, he meets Isaki Magari, a girl with the same condition. A strange, but special relationship forms as they share a secret and catch up on their sleep in their school’s abandoned observatory… 
 
(Source: HIDIVE)

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Jad is an American voice actress and ADR director who works for Funimation and Sentai Filmworks. Her name is an acronym of her parents' names, Jimmy and David, and is pronounced as Jade. Her singing led to her first voice role in Sasami: Magical Girls Club as Eimi Mori, and her first major voice role was Masako Hara in Ghost Hunt. She graduated summa cum laude from Texas Wesleyan University with a Bachelor of Arts in Music in 2005.

(Source: Wikipedia)

Nakami is a studious but cranky and antisocial high schooler who gets on his classmates' nerves. However, his bad attitude comes from the fact that he has a sleeping disorder, and frequently spends nights on end without a single minute of sleep. During the preparations for the school festival, he is begrudgingly sent to the school's astronomy observatory to gather cardboard boxes, a place which is said to be haunted by the dire happenings of the now defunct Astronomy Club. He finds the isolated place a haven ripe for him to sleep, but while rummaging around, he stumbles upon his classmate Magari Isaki sleeping inside a toppled-over locker. 
 
Isaki, unlike him, is a personable and popular girl at class, but who also hides her own problems with insomnia. Looking for a middle ground, they find that there's comfort and ease in sleeping together, so they resort to make the observatory their own private cubby to sleep... Have they found the comfort they're looking for?
 
Note: Nominated for the Tsugimanga 2020 Award in the Manga Category.

A promotional video directed by Yuuki Ikeda commemorating the release of the seventh Kimi wa Houkago Insomnia manga volume.