100 Nichi Go ni Shinu Wani

100 Nichi Go ni Shinu Wani (100日後に死ぬワニ; "A Crocodile Who Will Die in 100 Days") is a Japanese web manga series written and illustrated by Yuuki Kikuchi. It is also well known as the abbreviated "100 Wani". The series, which depicts a crocodile's last 100 days before his death, was self-published on Twitter between December 2019 and March 2020. A single tankōbon volume was published by Shougakukan in April 2020. An anime film adaptation produced by TIA, titled 100 Nichikan Ikita Wani (100日間生きたワニ; "A Crocodile Who Lived For 100 Days"), was scheduled to be released in May 2021, but was delayed to July 2021, due to the COVID-19 pandemic.

The main character is a male crocodile who wears clothes and speaks Japanese. The story depicts the everyday life of the crocodile, who will die 100 days after the first episode, and spends it with his friends, including his senior crocodile and his best friend, Mouse. Up until the 99th day, the number of days until his death is counted under the fourth panel. Each time a new episode is published each day, the remaining days decrease. The story is linked to the time of year during which it is serialized, and cultural events such as New Year's Day are also reflected in the story.

The author explained his reasons for creating this work as follows:

"We will all die someday." To be alive is to die someday. If we are conscious of our own "end" and the "end" of those around us, perhaps our actions and way of life will move in a better direction. I hope that the crocodile will be an opportunity to think about these things. - ORICON NEWS (January 16, 2020)

Taiwanese media outlet 4Gamers and others have pointed out that the ending of this work may be related to the accidental death of a friend that Kikuchi mentioned on his website. Kikuchi revealed in a live stream on March 21, 2020, the day after the final episode, that this was actually one of the reasons he decided to write the work. He said that he wanted to convey the message that people should cherish their limited time, even though they don't know what will happen. According to Kikuchi, the characters in this work are not based on any specific individuals, but are a mix of people he has met and his experiences in life.

Written and illustrated by Yuuki Kikuchi, 100 Nichi Go ni Shinu Wani was published on the author's Twitter account from December 12, 2019, to March 20, 2020.^[1] The 100 days of the crocodile's life are counted down by four panels (13 panels in the final chapter, including the large panel) per day. The manga garnered over 300,000 likes per post, and was the number one trending topic on X (formerly known as Twitter) in the world on March 20, 2020, the day the series ended. A single tankōbon volume was published by Shougakukan on April 8, 2020.^[2] A sequel manga titled 100 Nichi Go ni Shinu (X) Nezumi was serialized on the same Twitter account from August 21 to November 29, 2024.^[3] A single tankōbon volume was published by Futabasha on December 18, 2024.^[4]

An anime film adaptation produced by TIA, titled 100 Nichikan Ikita Wani (100日間生きたワニ; "A Crocodile Who Lived For 100 Days"), was scheduled to be released on May 28, 2021,^[1][5][6] but was delayed to July 9, 2021, due to the COVID-19 pandemic.^[7][8]

The manga was ranked 28th in Kadokawa Corporation's Da Vinci magazine's "Book of the Year" list in 2020.^[9]

• 100 Nichi Go ni Shinu Wani (manga) at Anime News Network's encyclopedia
• 100 Nichi Go ni Shinu Wani (anime) at Anime News Network's encyclopedia