In the early 20th century in Hokkaido, Japan, a treasure hunt between various parties takes place for a hidden stash of gold.
Haruka is new at her school and is in turn bullied and harassed by the students with one exception. Haruka's only friend is Mitsusru who makes attending class and life more tolerable. ...
A soul, homestays in the body of a deceased high school student. While reincarnated, it must find the student's death cause. Limited to 100 days, a glimmer of light and large darkness intersect in the truth.