Life Return (Seimei Kikan)

Subject: Life Return (Seimei Kikan)
Era: Present
Related: Six Powers (Rokushiki)CP9
Name meaning: 生命帰還 *Seimei Kikan* — 生命 *seimei* 'life / vital force' + 帰還 *kikan* 'return / homecoming, restoration to a place' (VIZ 'Life Return'). The name reads as 'bringing one's life/body functions back under one's own command': an art of consciously returning/commanding every function of one's own body — including normally-involuntary ones (hair, organs, digestion/metabolism). Kanji & reading confirmed via One Piece Wiki. On-page, Chopper names the real-world parallel: 'bio-feedback' (@0406 p. 12).

Structural lore — what Oda has confirmed about this. Mysteries (unsolved questions) live in Vault/Threads/; this is what the world IS.

Structural-lore note. Named and defined on-page for the first time Ch. 406 (pp. 11–13) by Kumadori.

What we know

What it is: a hermit-trained art of total conscious control over one’s own body — “from the hair on one’s head, from one’s vital organs to the tips of one’s toes, even to the end of one’s ‘short hairs’ — there is not a single spot that cannot be controlled with one’s consciousness.” Mastered by inhaling/swallowing the mist while living as a hermit “a millennium in the sea, a millennium in the mountains.”
Demonstrated uses (Kumadori, Ch. 406): animating his long hair like an octopus’s tentacles (“Hair Bind!”, “Shishi Kabob!”, “Shishi Finger Pistol!!”); “Absorb!” → “Digest!” to instantly fatten then thin his body by controlling digestion/mass (pp. 11–12).
Framing: Chopper identifies it as real “bio-feedback” he “read about in a book” (p. 12) — i.e. NOT a Devil Fruit and NOT one of the Six Powers (it stacks alongside Six Powers (Rokushiki)).

Characters connected: Kumadori, CP9
Related lore: Six Powers (Rokushiki) (a SEPARATE trained art — Life Return stacks on top), Hito Hito no Mi (Chopper’s contrast — fruit-based vs. trained body control)
Foreshadowing seeds about this topic: Life Return Seimei Kikan Hermit Body-Control Art Debut