Gochuumon wa Usagi desu ka?? Dear My Sister

Cocoa returns to her family in the mountains after receiving a letter from her sister Mocha asking her to come back. Her friends must spend a week in the town without her while she reunites with her family. Chino, who considers herself Cocoa’s younger sister, wants to attend the upcoming fireworks festival with Cocoa and her friends in less than a week. Missing her friends, Cocoa decides to leave her family early to return, but it remains uncertain if she will make it in time for the festival’s main event.