In addition to his solo work, he is one half of the music duo After the Rain with fellow utaite singer Soraru.
When he was in elementary school, he tried to make ring tones with an app on a mobile phone his father gave him.
[16] Since his life in the music industry began, he has stored vocabulary and experiences within himself, which he pulls on when composing and writing lyrics.
(ひきこもりたちでもフェスがしたい！) and performed alongside Soraru, Amatsuki, Urashimasakatasen, luz, un:c, Araki, nqrse, and kradness.
[24] On 22 June 2019, he held a solo live performance at the MetLife Dome with an audience of 35,000 people.
[25][26] On the next day, 23 June, Mafumafu hosted the annual Hikikomori-tachi demo Fest ga shitai!
[31][32] Mafumafu also wrote the lyrics, composed, and arranged the music for the opening theme of Pokémon Journeys, scheduled to first air on 17 November 2019, on TV Tokyo.
[34] Mafumafu was scheduled to hold a solo show at the Tokyo Dome on 25 March 2020[35] as well as his Hikikomori-tachi demo Fest ga shitai!
He is currently posting videos with fellow utaite singers and friends Soraru, Amatsuki, Uratanuki, Ahono sakata, luz, as well as game commentator Kiyo.
The second season, Hikimaru 2nd, started on 26 September 2019, with a line up of eight people consisting of Mafumafu, Soraru, Amatsuki, luz, Uratanuki, Shima, Tonari no sakata, and Senra.
[42] On January 25, 2024, the weekly tabloid Josei Seven reported that Mafumafu had been married for a short period from December 2021 to July 2022 and is involved in legal proceedings against his ex-wife.
[43] Mafumafu confirmed the reports on his blog the next day, explaining that he had been subjected to various emotional abuse, cheating, and defamation through online harassment by his ex-wife, who he referred to as Girl A (A子).
[44][45] On January 28, the online streamer and VTuber Mikeneko posted a response, confirming she was Girl A in the process.