100-nichigo ni Shinu Wani  

This Croc Will Die In 100 Days, 100日後に死ぬワニ

Rheine wrote about a crocodile who lived his everyday life contentedly, spending time with companions, working part-time, and even experiencing love. Despite this, he was unaware that he would die in 100 days.

100-nichigo ni Shinu Wani is a web manga released on the author's Twitter and Instagram accounts from December 12, 2019 to March 20, 2020, and published in print by Shogakukan on April 8, 2020.