BOOK
#100 Days Challenge: Unfiltered Edition goes on sale on BOOTH
Author and app developer Ami Otsuka (representative of Hundreds LLC) released the digital book #100 Days Challenge: Unfiltered Edition on BOOTH on July 15, 2026. It is priced at 1,480 yen.
The book expands on material left out of the Nikkei BP edition of #100 Days Challenge and presents it as a separate title. It covers the kind of content a commercially published book had no room for.
Several copies were bought on the day of release.
Linksamiotsuka.booth.pm
About Ami Otsuka
Author and app developer; representative of Hundreds LLC. Starting in October 2023, while a student at Chuo University, she built an app a day with ChatGPT for 100 consecutive days and posted each one to X, a record published as #100 Days Challenge: I Built 100 Apps in 100 Days and My Life Changed (Nikkei BP, 2025). Named to Forbes JAPAN's Women In Tech 30 in 2026. She is now based in Thailand, writing, speaking and building apps.
