"Ultra Sakusen Katokutai Shutsugeki Seyo!" is a 1992 adventure game, developed by Banpresto for NEC's PC-98. It's an official prequel to the first TV series Ultraman. The original monsters were designed by Nishikawa Shinji.

See also:

• GAME DATABASE: https://refuge.tokyo/pc9801/pc98/02158.html
• pulog1's Kaijuu Blog (Japanese): http://pulog1.exblog.jp/2959347/