Additionally, Seba collaborated on the soundtrack for Shinichirō Watanabe's anime series Samurai Champloo (Music Record: Departure and Impression) in 2004.

[3] Seba's father worked for the National Tax Agency, but was an amateur jazz pianist and exposed him to music at a young age.

[9] Despite spending many days together over the years, experimenting with Max software and listening to new music, they only finished one track together, "Rotary Park", one of Seba's most experimental works.

Recorded and mixed in Seba's private Park Avenue Studio, the album's initial release was modest, with recognition growing significantly in later years, to eventually become a cult classic.

[6] Seba was one of the main contributors to the soundtrack of the anime series Samurai Champloo directed by Shinichirō Watanabe, which blended a feudal Japanese setting with modern anachronisms, such as hip hop culture, graffiti, and rapping.

[17] To this project Seba contributed some of the most popular tracks: the opening theme "Battlecry" (another collaboration with Shing02), "Aruarian Dance", which spread virally through the internet,[18] and "Departure" and "Impression" which became seminal works for lo-fi hip hop artists.

[6][13] This success catapulted Seba, who at the time was still an underground figure, into the international spotlight and reached many fans who would later discover his earlier works.

Like his debut album, Modal Soul fuses jazzy, smooth rhythms and hip hop, but with more downtempo and a different quality to transitions and mixing that has been attributed to Fat Jon's influence.

[6] On February 26, 2010, Seba was involved in a traffic collision leaving the Shuto Expressway in Tokyo: he was taken to a hospital in Shibuya Ward, where he was pronounced dead after efforts to revive him were unsuccessful.

[22] Spiritual State features work from some of Seba's classic collaborators like Pase Rock, Substantial, Cise Starr, and Uyama Hiroto, as well as introducing Haruka Nakamura.

[26] Frequent collaborator Shing02 paid tribute to Seba, saying he was "a unique talent", "a close friend", and that "he [had] touched so many people around the world, even beyond his dreams".

[27] He has since performed at several tribute concerts for Seba, including at the anime convention Otakon in 2019, along with artists such as musician Minmi and rapper Substantial.

[28] On November 11, 2010, his label released a tribute compilation album, Modal Soul Classics II, featuring previous collaborators and covers and remixes of his songs.

[37] Seba has generally been described as humble, quiet, calm, unassuming, and shy,[8][7][38][39] but also as having strong passions for food,[6] soccer,[39] and being uncompromising, meticulous, and a perfectionist when it came to his work.