Kenshi Yonezu.

Kenshi Yonezu (米津 玄師), also known by his producer name Hachi (ハチ), is best described as a Japanese singer-songwriter, musician, record producer, and illustrator. He began his career in 2009 creating Vocaloid works using the name Hachi, later debuting under his real name in 2012 with the self-sung album “Diorama”. Additional background says that Known for his poetic lyricism, genre-blending sound, and distinctive hand-drawn artwork, Yonezu has become one of Japan’s most influential contemporary artists, with multiple chart-topping releases and millions of physical and digital sales. The profile also notes that His 2022 single “Kick Back”, used as the opening theme for Chainsaw Man, became the first Japanese-language song to earn RIAA Gold certification in the United States.