Musical Hetalia ~The world is wonderful~ (2021)

Long ago, in the world, brothers Italy and Romano lived happily and cheerfully with their big-hearted Grandpa Roma. Time passed, and those around them began to grow stronger, and before they knew it, Grandpa Roma was gone, and the brothers were separated. "We'll meet again! One day, we'll become as strong as Grandpa Roma!" So they vowed to each other...