If you spot an anomaly, turn back.

The beloved Bansen series—“2-ban-sen | Nibansen,” “3-ban-sen | Sanbansen,” “4-ban-sen | Platform 4,” and “5-ban-sen – Rescue the Old Man”—returns with online co-op at last!
Team up with up to 4 friends, report anomalies in real time, and secure each stage. Experience the classic tension of a silent platform × sudden anomalies together.

New Features

• First-ever Online Mode – Split roles and hunt anomalies efficiently.

• Freely swap Online / Offline – Solo focus or lively co-op; switch anytime.

• Back to the roots – Pure anomaly-spotting gameplay, while rescue stays a separate spin-off.

• Most anomalies ever – The largest anomaly pool in series history means fresh surprises every run.

• Up to 4-player Co-op – Divide into Search / Rescue squads; if anyone fails to retreat, it’s game over—teamwork is vital.

Hallmarks Fans Call “God-Tier”

• Realistic looped platforms & in-world signage (“If an anomaly occurs, return by the opposite route!”).

• Chills-at-first-sight observation gameplay echoing the original’s huge map and jump-scares.

• Snappy pacing – 1-20 min rounds, instant retries.

• Refined difficulty curve – The best of 3-ban-sen’s challenge and 4-ban-sen’s accessibility.

• Fan-favorite characters – The “old man” from 5-ban-sen will cameo again!

Perfect For Players Who…

• Love the co-op vibe of Phasmophobia or Lethal Company.

• Want an Exit 8-style observation game with friends.

• Prefer puzzles over pure horror—get spooked and laugh together.

Streaming / Video Guidelines

• No permission needed & monetization allowed.
  Feel free to create and upload gameplay, streams, clips, or reviews—personal or corporate.
  Ad revenue, Super Chats, memberships, sponsorships on YouTube, Twitch, NicoNico, etc. are all OK.

• Please note: Guidelines may change without notice. Check our official X (Twitter) for the latest info.

Anomalies lurking on late-night platforms are scarier—and more fun—when shared.
All aboard the anomaly-hunt with your friends!