We’re still very much in Koguma’s head in episode 3, but that’s understandable. Despite exchanging greetings—Koguma’s “Good morning” to Reiko’s “mmm”—Reiko is still more of an acquaintance to Koguma than a friend. And while it’s clear from the OP and the promo art that the friendship between these two kindred spirits is a foregone conclusion, it’s still too early for that adhesion to happen. In fact, I suspect that their friendship will eventually grow into something more. Not romatically, but rather a close bond formed over their love of Cubs, and the freedom these bikes have brought each girl.