Kokepii

Lifespan: 100 Days (3 Months)

Bucky is introduced as the Chicken Devil.

The purpose of Bucky was to be killed and eaten by the fellow Students in the Classroom in order to teach them how precious Life is (this was conducted by their Class Teacher who is known as Mr. Tanaka)

As the Days passed, the Students gained a sense of affection for Bucky and didn't feel the need to kill him, knowing this... Mr. Tanaka was grateful that this "experiment" was a success.