He and his partner, Ryo Tamura (田村 亮), form the Japanese comedic duo (お笑いコンビ, owarai kombi) known as "London Boots Ichi-go Ni-go" (ロンドンブーツ1号2号, Rondon Būtsu Ichi-gō Ni-gō).
They called themselves Umaseki Fugutarō and Fugunosuke, a name they derived from Shimonoseki, and fugu or pufferfish, a dish famous in the region.
While Atsushi was once on the receiving end of the duo's jokes, he has since taken the dominant role and does not hesitate to subject Ryo to severe acts of embarrassment.
As London Boots, Atsushi and Ryo also serve as the hosts of many shows and special programs on Japanese television.
If this is the case, the woman will step in to a room and unexpectedly find herself standing in front of her boyfriend, London Boots and a camera crew.
Atsushi and most others within Yoshimoto thought the ban was unfair, which prompted him to create another talent agency, London Boots, which Ryo joined on January 10, 2020, to resume activities in the entertainment industry.
However, he finally landed a major role as voice actor for Yoichi Hiruma (Eyeshield 21), who, like Atsushi, often tricks people, and has as a "servant" like Ryo.
He performed live with his band in April 2007 and made their major debut with the song Chikai, released on October 31, 2007.