Butterfly Swimmer
Hanabi and Mugi made a promise to see each other again after they confessed their feelings to their respective first loves, but Mugi never showed up.Not soon after, Hanabi accepts an invitation from Sanae to go on a trip to Karuizawa with her.
Aired 10/03/2017EP 9 - Butterfly Swimmer

Scum's Wish
Hanabi has loved her older friend Narumi for years, but she’s still in high school and not only is Narumi now her new homeroom teacher, he’s also clearly in love with the music teacher, Akane. And as awkward as being the unwanted third in a romantic triangle can be, things become even more twisted for Hanabi when she learns that another student, Mugi, is in love with Akane. That leads to a strange idea: since the ones that Mugi and Hanabi are in love with aren’t available, the two unrequited thirds start to explore the idea of becoming each other’s substitute surrogate relationship. It’s not about romance, of course. Just sex and convenience.
(Source: Sentai Filmworks)