Girls of the Thirteenth Month

13月の女の子

Also known as 13gatsu Girls, 13-gatsu no Onnanoko, March Girl, Girls in March, 13月的女孩

Kazuho Anamori, ​​who had difficulty fitting in with her class, meets Miko Karakida, who suffers from heart disease, and becomes close friends with her, however, six months later, Miko dies while hospitalized. Kazuho receives a letter saying that there is something to discuss about Miko. When she goes to the address she has been called to, she finds a mysterious transfer student, Rio Ukima, waiting for her.