Daiban Kaikan Shinjuku

The Shinjuku branch of the Daiban chain sits in Kabukichō, a short walk over from Ni-chōme, and does the budget version of the bathhouse night: gown style, around the clock, roughly ¥2,500 for a rest until 23:00 and ¥3,000 overnight. An 'all genre' door, less crowded than the 24 Kaikan flagship — a first-hand 2025 visit report confirms it exactly as described.

Honest note: no official website, no English support, and no stated policy on foreign guests — unverified for non-Japanese visitors. Cash and courtesy recommended; report back if you go.