The Secret Detective Team BL led by Yumihiko Otonashi refuses superhuman registration and has continued to act on their own with a massive robot named Gigander Seven. Then, Yumihiko receives a notice saying the evil superhuman Lucifer's Eyes will steal superhuman Rainbow Knight's "Crescent Gun" from a collector. Rainbow Knight is a popular superhuman who gave hope to Japan after the war, and Jiro too holds dearly an experience where he was saved by Rainbow Knight...