A Japanese salaryman falls asleep and wakes up in the body of a five-year-old boy.

Wendelin decides to keep his magic secret. Wendelin wants to become an adventurer.

Wendelin tries to make friends at Adventures Academy; Erwin, Louise and Iina form an adventuring party with Wendelin.

Wendelin defeats the bone dragon and collects the valuable bones and crystal heart.

Hohenheim tricks Wendelin into forming a political marriage with Elize; Wendelin Erwin as his retainer.

Elize visits Louise, Lina and Erwin; the King asks Wendelin and Brantack to slay an ancient dragon, Greigorland.