Takopi travels from his home of Happy Planet to spread happiness on Earth, but meets the unsmiling Shizuka. Her school friends and home life are causing her somber expression and pure hearted Takopi is determined to change things.

Three high school students are transported to a fantasy world. But while two are heroes, one can only be a healer.

A necromancer in a distant era incarnates himself into a young boy in modern Tokyo. But he gets caught in a mystery about the boy and his own past.