Shinnosuke Tenmaya runs Tenmanya, a dual-purpose specialty store and employment agency dedicated exclusively to vampires. This enterprise supplies vital resources like sustenance and aid with family registry formalities, cementing his role as a critical facilitator for vampires seeking societal acceptance. Orphaned at birth after his mother’s death, he was raised by vampires—guided by his grandfather and undead guardians—which forged his worldview. Childhood bullying over his Japanese-American heritage bred a lasting resentment toward humans, driving him to dye his hair black to mask his identity.

His striking appearance merges tradition with flair: a loosely draped purple kimono secured by a turquoise obi, black underlayers edged in white, and a gold brooch. A monocle, tabi socks, and hiyori geta sandals complement his look, while a braid interlaced with feathers and purple streaks crowns his hair. The name *Tenmaya*—combining "heaven," "full," and "shop"—mirrors his mission as a provider.

Within *MARS RED: Edge of The Nightmare*, Tenmanya’s staff includes Ishikawa, an unranked vampire and swordmaster, reflecting Shinnosuke’s strategy to sustain vampire networks. The establishment doubles as a sanctuary and tactical hub, countering human hostility through resource distribution and covert support. His pragmatic loyalty to vampires stems from childhood trauma and systemic rejection, anchoring his unwavering focus on safeguarding their community.

His narrative remains anchored in this role across media, prioritizing logistical aid and operational stability for vampires without deviation, underscoring a relentless dedication shaped by personal history and defiance of human society.