With everyone stuck doing summer lessons during the summer break, Shiina invites Ryo and Kirin over to her place to do some summer activities that they wouldn't be able to do otherwise. Upon arriving at Shiina's extravagant home, Kirin receives a tomato from someone she assumes is Shiina's mother, only to find her actual mother is someone completely different. Later, as the girls go searching for bamboo for a sōmen slide, they discover the woman from before is actually Shiina's household maid, Tsuyuko. While Shiina's mother prepares the slide, Tsuyuko helps Ryo and Kirin prepare the noodles and sauce. Later, Shiina's mother reveals she was the one who asked Shiina to invite Ryo and Kirin over, thanking them for being her friend. Afterwards, they have an overdue Tanabata festival and fireworks, crossing off pretty much every summer activity they had in mind.