It is a semi-real-time adventure game developed in 1983. It was released by MIA under the title “ONION HOUSE”, although it was originally known during development as “Circumference.” The game features a distinctive system that combines the command-based adventure game format popular at the time with real-time action elements. It is characterized by a high level of difficulty and complex puzzles, and has been regarded as a title that divided opinions since its release. The game was distributed on cassette tape. Its original retail price was 980 yen. The supported platform is the PC-6001.