is a Japanese manga series written and illustrated by Hiroshi Shiibashi. It was initially published as a one-shot published on Shueisha's Shà Ânen Jump+ manga service in March 2020. It later began serialization in Shueisha's manga magazine Ultra Jump in February 2021. An anime television series adaptation produced by Studio Deen is set to premiere in July 2026.
In the 1910s, Kodà  Iwamoto, a middle school student at a school controlled by the military, is tasked with investigating paranormal phenomena. A cases arises where a villiage is rumored to have black snow falling. Upon investigating, Kodà  meets a boy with powers that he perceives as a sickness. Kodà  shows him how to use his powers and offers him a letter of recommendation to join the school and participate in future investigations.
Written and illustrated by Hiroshi Shiibashi, Iwamoto-senpai no Suisen was initially published as a one-shot on Shueisha's Shà Ânen Jump+ manga service on March 30, 2020. It later began serialization in Shueisha's manga magazine Ultra Jump on February 19, 2021. Its chapters have been compiled into thirteen volumes as of January 2026.
An anime television series adaptation was announced on January 16, 2026. The series will be produced by Studio Deen and directed by Toshifumi Kawase, with Keiichirà  à Âchi supervising series scripts, Atsuko Nakajima designing the characters, and Yoshiaki Dewa and Tà Âru Ishitsuka composing the music. It is set to premiere in July 2026.