His film Speed Girl won the Grand Prix at Sundance/NHK International Filmmakers Award in 2009. Everytime We Say Goodbye was awarded the Grand Prix and Audience Award at Asia's largest film festival, Short Short Film & Asia, a festival officially recognized by the Academy Awards. In 2017, he wrote and directed the TV series, Futari Monologue. In 2019, he released Indigo Children, a full-length feature film, and two short films, Goodbye Dorothy and Robin. Kenji didn't slow down during the pandemic. He directed 6 episodes of Aikatsu Planet! in 2021. In 2022, he wrote and directed two films based on the popular video game, A3!, which has been downloaded over 7.5 million times. The two films, Mankai Movie A3! Spring & Summer and Mankai Movie A3! Autumn & Winter will be released worldwide in 2023.