The☆Ultraman

Mysterious luminous symbols begin appearing in Earth's skies as monster activity rises across the planet. While returning from a space station, Science Guard officer Chouichirou Hikari encounters Ultraman Joneus of U40, who warns that Earth is heading toward grave danger.

Unable to remain on the planet in his natural form, Joneus merges with Hikari. Whenever monsters or alien forces threaten humanity, the officer can transform into the gigantic Ultraman, fighting alongside the Science Guard while keeping the truth of his connection to U40 hidden.