Studio DEEN’s adaptation of the popular isekai light novel series Isekai Tensei Soudouki — known in English as Multi-Mind Mayhem — has released its first promotional video alongside a complete cast and staff lineup, with a confirmed January 2027 broadcast premiere. Fans who love a good scheming-nobleman story with a twist will want to pay attention to this one.
Noble × Warlord × Otaku — A Three-Soul Premise
The central hook of Isekai Tensei Soudouki is its unusual triple-soul gimmick. Bard Cornelius is the young son of a Maurician nobleman — but crammed into his body alongside his own consciousness are two souls from past lives: Oka Sanai Sadatoshi, a ruthless Sengoku-era warlord, and Masaharu Oka, a modern Japanese high school student with a passionate love of kemonomimi. The result is a protagonist who can out-negotiate a merchant, out-manoeuvre a general, and probably name every anime cat-girl in history — all at age eight.
The light novel series was written by Ryōsen Takami and originally ran on Shōsetsuka ni Narō from 2013, before being published in print by AlphaPolis (Japanese) across 14 volumes. The series has sold over 1.35 million copies in total. A manga adaptation drawn by Honoji has run for 14 volumes through AlphaPolis, with English-language editions published by One Peace Books (print) and Alpha Manga (digital) — both ship internationally, so Singapore readers can get into the story now ahead of the anime.
Watch the First PV
The PV is deliberately restrained — there is no big action sequence or song reveal — but it does exactly what it needs to: sell the triple-personality dynamic. Director Hiroaki Sakurai (Di Gi Charat, Bottle Fairy) is helming the series at Studio DEEN, with Keiichirō Ōchi (The Quintessential Quintuplets) on series composition and Ryoshi Takagi composing the music.
Full Cast and Staff
The voice cast was confirmed alongside the PV:
- Bard Cornelius — Yūsuke Kobayashi
- Oka Sanai Sadatoshi (the warlord soul) — Takashi Matsuyama
- Masaharu Oka (the otaku soul) — Satoshi Inomata
- Seillune (Bard’s maid) — Yukari Anzai
- Selina (beastgirl merchant) — Ayasa Itō
- Silke (noble-school student) — Sumire Morohoshi
Kobayashi commented at animatetimes.com (Japanese) that voicing Bard is both rewarding and demanding precisely because the character must convey three distinct internal personas at once — the noble boy, the battle-seasoned warrior, and the pop-culture-obsessed teenager — while still reading as a single coherent child.
No broadcaster or streaming platform has been named yet — a broadcaster announcement and second PV are likely to follow in the months ahead. Follow the official @soudouki_anime account on X for the latest updates. For more anime and manga news, check our ongoing coverage.