Narumi and Hirotaka bump into Koyanagi at the coffee shop, who mentions she'll be going with Kabakura to a 2.5D show about high school volleyball. They recall how the two used to be volleyball captains in high school, in 2nd and 3rd year respectively, with Koyanagi saying how they used to be like enemies, prompting them to pressure her to tell them how they eventually become a couple...