He initially serialized the series as a web novel (writing under the username Nezumi-iro Neko (鼠色猫, "Mouse-Colored Cat")[1]) on the user-generated content site Shōsetsuka ni Narō from April 20, 2012 onwards.
[2][3] As of April 1, 2016[update], he has published thirty eight novels and five side stories, comprising a total of 686 chapters.
The series adapted into anime, manga and visual novel.
Nagatsuki was very active in the production of the anime, attending script meetings, recording sessions, and dubbing.
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