While Kato worked as a health professional, he continued to stream Let's Play videos as Unko-chan.

[6] In the summer of 2016, Kato retired from his job as a health professional to pursue content creation full-time,[7] and he joined MURASH.

The total amount of money donated in the form of Super Chats was 200 million yen (approximately $1.8 million at the 2022 rate) on YouTube, achieving first place in the overall Super Chat ranking for the year.

In January of the following year, members officially signed contracts for the Valorant and Super Smash Bros. divisions.

Despite lacking prior soccer experience, he made the decision to enter the Kings League for the first time, representing Japan, after receiving a direct offer from Gerard Piqué[12][13] On September 12, 2024, Kato was photographed in the front row seats of Dodger Stadium in Los Angeles with a woman who was alleged to be the pornographic actress Ai Hongo [ja].