Ultraman (1966): Season 35, Episode 7

35 - 7: Rainbow Appears: Part 1

Upside-down rainbows are being sighted throughout Japan. They are said to herald the onset of rain. Gento suspects that a kaiju may be behind this and decides to visit Professor Yokomine, a leading kaijuologist and also his mentor from school.

Yokomine tells him about Nijikagachi, a god-like being that can at times bless the land with rain and at times summon utter destruction. That's when Gento receives news about an appearance of a giant kaiju!