Having recently obtainedRika's phone number, Sensei decides to call her and see if she's free to hang out. When she picks up, Rika immediately asks him if it's possible to outrun the rain, reminding him just what sort of person she is. After disconfirming this theory of hers, she invites him out to hang out with him. He initially assumes she's still hanging around Rin and Futaba's dorm, but soon learns she's currently exercising with the two at the gym. After getting permission from Futaba to show up, he makes his way over, learning why Rika asked about rain when it starts to pour on him.
He arrives at the gym, drenched in rainwater much to everyone's confusion. He ignores their concern and asks how things are, to which Rin sarcastically responds, still concerned about him. Rika meanwhile feels great, asking if comes to the gym often so she can have a partner on days Rin and Futaba are busy. He responds that he doesn't and has no real intention to start, making Rika confused about how he stays in shape. When Futaba and Rin give suspiciously awkward answers, she incorrectly guesses him to be a secret dancer. Now confused himself, Sense asks how she possibly came to that conclusion, becoming more confused and somewhat annoyed as the girls comment on his build. As he goes to leave, Rika walks out with him, wanting to take a proper break from exercising.
The two stand under an awning and Sensei takes the opportunity to ask Rika about what raising Rin was like. She tells him it has its ups and downs, but that the real tragedy is when your child decides they're too cool for you. He tries to reassure her by telling her about all the nice things Rin has said about her but only makes her feel worse when he can't recall anything. He tries to salvage this by saying that it's clear Rin appreciates her, even if she is constantly embarrassed by her. Rika's happy to hear this, having wanted to avoid an awkward relationship between them as she had with her mother. Sensei restates Rin's appreciation, adding that being embarrassed is a much better alternative to her potentially living in an orphanage forever.
Rika agrees, admitting she often forgets Rin's adopted since they've been together so long. She also confesses that while Rin sees their family as normal now, it wasn't always like that and that she was rarely sure what to do raising her, unlike her partner. This pushes her to reflect on Rin's adoption, more specifically the kids they didn't end up choosing. While Sensei can't relate to the desire to have kids, he sympathizes with that mindset, saying he'd probably fall into the same train of thought if he was ever in the situation.
Hearing this, she jokingly warns him not to go out and create more orphans, telling him not everyone is as lucky as Rin was. Using this, he segues into asking about Rin's biological parents, which Rika initially hesitates to talk about. According to the case worker, Rin's biological mom was mentally unstable and also way too young to handle raising a kid, meanwhile, her father was absent entirely. She cites this as a good example of how his recklessness might cause some kid suffering – He reassures her he has no intention of doing such. Rika retorts that it isn't always intentional, and asks what he'd do in the situation where he was forced between accepting responsibility or running away. He refuses to answer.
Having slowly picked up on his personality, Rika starts to see why Rin likes him so much, citing it's because he's a "goober". This nickname upsets Sensei and eventually pushes him into leaving, once again getting soaked by the rain.