He began publishing song cover videos on
Niconico in late 2010. In interviews, he has said that he enjoys listening to a variety of music including electronic, and that he was drawn to music because his childhood was painful and he felt he could convey in music the emotions he had difficulty expressing otherwise. He also believes he grows when he is able to overcome the things he did not know or was unable to do before. 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. While Mafumafu primarily works on his solo
dōjin albums, he has done two albums with
utaite singer Soraru. On 13 April 2016, they released
Crocrest Story under the name After the Rain under the
Universal Entertainment Japan label. Mafumafu handled most of the composition and arrangement for the album. His first solo tour ran from 15 January to 5 February 2017. On 7 May, Mafumafu hosted and performed alongside Soraru,
Amatsuki,
Urashimasakatasen,
luz, un:c, Araki,
nqrse, and kradness. On 18 October 2017, he released the album titled , an album which looks at the end of the world.
Connected to Disney, an official Disney cover album, was released on 13 March 2019. Mafumafu helped produce the album, as well as performed alongside six other singers. On 22 June 2019, he held a solo live performance at the
MetLife Dome with an audience of 35,000 people. On the next day, 23 June, Mafumafu hosted the annual . In July, Mafumafu released the single . This was his first time creating music for an anime, this time for the anime
To the Abandoned Sacred Beasts (Season 1). His album titled was released through
A-Sketch Inc. on 16 October. There were 20 songs in the album, more than any other album Mafumafu had previously released. He attempted to select the best 20 songs he was capable of creating and included songs with a variety of musical styles, which was a different trend from previous albums. 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. The opening theme "One, Two, Three" is sung by After the Rain, Mafumafu and Soraru's music duo, for the first 31 episodes.'''' On 16 February 2020, Mafumafu was found unconscious in his living room by staff visiting his home. He was transported to a medical institution, where he was diagnosed with cardiogenic
syncope. Mafumafu was scheduled to hold a solo show at the
Tokyo Dome on 25 March 2020 as well as his () in the Tokyo Dome on 26 March. However, he announced on 12 March that he would hold off on the performances due to the impacts of
COVID-19. While he did consider postponing the events to a later date, it was officially announced on 31 March that they were canceled. Sales of Mafumafu's first video release was scheduled to go on sale on 14 October 2020, consisting of video shot during his 2019 performance at the MetLife Dome. Mafumafu continues to be active on both YouTube and Niconico. He has participated in live shows and summer comic market events. He is currently posting videos with fellow
utaite singers and friends Soraru, Amatsuki, Uratanuki, Aho no sakata, as well as game commentator Kiyo. Mafumafu has a
Teru teru bōzu character called which acts as his guardian. Mafuteru is sometimes said to help Mafumafu with the illustrations and editing for his music videos. The internet series , also known as , started on 19 December 2018, with appearances by Mafumafu. 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. Mafumafu appeared in the
72nd NHK Kōhaku Uta Gassen on 31 December 2021, the first
utaite to do so. On 5 June 2022, Mafumafu announced on Twitter that after his following live performances on 11 and 12 June, he would go on an indefinite hiatus from all personal musical activities as Mafumafu for the first time in 11 years, citing his medical condition. He still plans to be active as a songwriter for other artists, as well as continue to participate in group collaborations. ==Other activities==