Wiki translation of the plot (apologies)
A youth drama in which Arisa Komiya, who is also active as a voice actor in the TV anime "Love Live! Sunshine !!", starred in the movie for the first time. Based on the stage of the same name that was performed in 2017 and 2019, director Akihiro Toda of "Name" will take a megaphone. Kazuho Anamori, a high school girl who is retired and unfamiliar with the class, becomes friends with Karakida Miko, who is born with heart disease, but the shrine maiden dies while in the hospital. A letter arrives to Ichiho, who is sad. Ichiho visits the school building at night alone according to the letter that there is a story about the shrine maiden. What was waiting for her there was Rion Ukima, a mysterious transfer student who appeared at the same time as the death of the shrine maiden. Honoka Akimoto of the idol group "TEAM SHACHI" from Nagoya will play the shrine maiden, and Minori Hagiwara of "Hello Goodbye" will play Rion. In addition, many young actresses such as Himika Akaneya of the voice actor unit "i ☆ Ris", Yuuka Tano of the former "AKB48", Mei Sakai of the former "SKE48", and Ruka Ishikawa of the movie "Let's meet in Sarakucho" will appear. ..
小宮有紗主演!映画「13月の女の子」予告編