Nobody knows about the Rainbow Knight

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. However, Rainbow Knight, the hero of justice, has been labeled as the culprit of the "Otetsu Kidnapping," and there was a conspiracy theory regarding the death involved...