Yuuna and the Haunted Hot Springs - Season 0 Episode 2 : Oboro of Yuragi Inn / Miyazaki and Koyuzu: Parent and Child 2018

Bundled with the 12th volume of the manga. Oboro asks for advice from all the residents of Yuuragi-Inn for ways to make Kogarashi fall in love with her but everything she tries goes in vain. While taking to Oboro during bath, Yuuna realises that she is in love with Kogarashi but denies it to Oboro. Koyuzu spents her summer at the Miyazaki's. Both Chisaki and her mother get fond of Koyuzu and ask her to stay with them forever but Koyuzu kindly rejects their offer because she thinks that if she starts living with them, she will come to accept that she is not a complete adult, which she doesn't want.