Caesium and the Girl(セシウムと少女)

Mimi-chan is a 17-year-old high school student and she lives with her parents in Asagaya, Tokyo. While walking home from school, Mimi-chan is hit by a lightning and meets Raijin Ra San (God of Lightning). Through Raijin Ra San, she also meets 7 other Gods. Mimi-chan soon undertakes an adventure to find something lost by her grandmother.