Night Walker: Mayonaka no Tantei

About

Night Walker: Mayonaka no Tantei is a 1993 visual novel built around mystery and character-driven storytelling. You play as Shido, a vampire detective with no memory of his past, who teams up with a government agent, an orphaned secretary, and a mischievous imp to solve cases involving supernatural threats. The game blends dialogue-based decision making with light puzzle elements, though combat is minimal. Each case unfolds through static illustrations and branching narratives, with outcomes shaped by player choices and relationship building. Despite its eroge roots, the tone leans more toward humor and lighthearted banter than darkness. Shido’s deadpan sarcasm and Guni’s antics often undercut the grim subject matter. The game began as a spin-off from Tomboy’s earlier Bishōjo Audition series but evolved into a standalone project with rewritten lore and redesigned characters. Running on 16-color PC-9801 graphics, it’s a relic of early 90s Japanese adult games that prioritized character dynamics over systemic complexity. Its cult status comes from a mix of nostalgic presentation and surprisingly warm character interactions.

Storyline

Shido Tatsuhiko is not only a private eye…he is also a vampire with no real memory of his past. Joined by Yayoi Matsunaga, a female government agent, Riho Yamazaki, an orphaned teenage girl working as his secretary, and Guni, a little green imp, Shido must face demonic creatures known as Nightbreed. Meanwhile, Cain, the vampire who made him what he is now, is seeking him…