Over 1.05 Million Subscribers! Active University Student YouTuber 'Eruninyo' Releases First Essay 'L-size Days'!
KADOKAWA released the first essay by YouTuber Eruninyo, 'L-size no Hibi,' on May 21, 2026. Celebrating his 10th anniversary, the book chronicles his life as both a student and a creator.
📋 Article Processing Timeline
- 📰 Published: May 21, 2026 at 20:00
- 🔍 Collected: May 21, 2026 at 11:31
- 🤖 AI Analyzed: May 22, 2026 at 05:59 (18h 27m after Collected)
## Publication of Eruninyo's First Essay 'L-size Days'
On May 21, 2026, KADOKAWA published the first essay collection, 'L-size no Hibi' (L-size Days), by active university student YouTuber Eruninyo.
### Background of Eruninyo's Career
Born on October 19, 2006, Eruninyo began his YouTube activities in 2016 when he was in the third grade of elementary school. He reached 1 million subscribers in October 2024, and the number surpassed 1.05 million as of March 2026. He is now a university student who balances academic studies with his active career as a YouTuber, representing a new generation of creators.
### Book Content
This book was published to commemorate his 10th anniversary in activities and his 20th birthday. It is not a flashy success story but a realistic portrayal of his struggles and growth—from his elementary school debut and his first viral moments to being identified at high school and juggling student council duties with content creation. It also includes group interviews with his family and friends, offering a closer look at his true self through the eyes of those who support him.
### Author's Comment (Excerpt)
'Balancing student life and being a YouTuber was not easy. Even during exam periods, I couldn't stop producing videos because I knew people were waiting for them, and I had to fulfill sponsored requests even when I was busy with student council activities. My 'true profession' is being a student. This book records my 'L-size' days—the everyday life of a student and a YouTuber who keeps moving forward despite doubts and setbacks.'
### Release Commemoration Events
To celebrate the release, events will be held in Tokyo and Osaka.
* **Tokyo:** Book Release Commemoration & 10th Anniversary IN Tokyo
* Date: June 27, 2026 (Sat)
* Venue: Tachikawa Creative Space
* Details/Tickets: https://erun1nyo.bitfan.id/events/18930
* **Osaka:** Eruninyo Book Release Commemoration & 10th Anniversary Talk Show, Autograph & Photo Session in Osaka
* Date: July 19, 2026 (Sun)
* Venue: Umeda Lateral
* Details/Tickets: https://livepocket.jp/e/989nk
### Bonus Information
Amazon.co.jp exclusive purchase bonus includes 'Limited Audio Data' for orders placed by August 31, 2026 (Mon).
On May 21, 2026, KADOKAWA published the first essay collection, 'L-size no Hibi' (L-size Days), by active university student YouTuber Eruninyo.
### Background of Eruninyo's Career
Born on October 19, 2006, Eruninyo began his YouTube activities in 2016 when he was in the third grade of elementary school. He reached 1 million subscribers in October 2024, and the number surpassed 1.05 million as of March 2026. He is now a university student who balances academic studies with his active career as a YouTuber, representing a new generation of creators.
### Book Content
This book was published to commemorate his 10th anniversary in activities and his 20th birthday. It is not a flashy success story but a realistic portrayal of his struggles and growth—from his elementary school debut and his first viral moments to being identified at high school and juggling student council duties with content creation. It also includes group interviews with his family and friends, offering a closer look at his true self through the eyes of those who support him.
### Author's Comment (Excerpt)
'Balancing student life and being a YouTuber was not easy. Even during exam periods, I couldn't stop producing videos because I knew people were waiting for them, and I had to fulfill sponsored requests even when I was busy with student council activities. My 'true profession' is being a student. This book records my 'L-size' days—the everyday life of a student and a YouTuber who keeps moving forward despite doubts and setbacks.'
### Release Commemoration Events
To celebrate the release, events will be held in Tokyo and Osaka.
* **Tokyo:** Book Release Commemoration & 10th Anniversary IN Tokyo
* Date: June 27, 2026 (Sat)
* Venue: Tachikawa Creative Space
* Details/Tickets: https://erun1nyo.bitfan.id/events/18930
* **Osaka:** Eruninyo Book Release Commemoration & 10th Anniversary Talk Show, Autograph & Photo Session in Osaka
* Date: July 19, 2026 (Sun)
* Venue: Umeda Lateral
* Details/Tickets: https://livepocket.jp/e/989nk
### Bonus Information
Amazon.co.jp exclusive purchase bonus includes 'Limited Audio Data' for orders placed by August 31, 2026 (Mon).
FAQ
What is the main theme of this book?
It records the balance between student life and YouTube activities, personal struggles, and his growth.
Where can I buy event tickets?
Tokyo event tickets are available on bitfan, and Osaka event tickets are on LivePocket.
Why is it titled 'L-size'?
It symbolizes the YouTuber's authentic 'life-sized' daily activities.