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!