Inari, Konkon, Koi Iroha Ep 5 - F2F Transformation

Episode 5 Jellyfish, Friends, Summer Storm
Later at night, after Inari ends up arguing with Chika about Akemi, she transforms into Keiko to protect Akemi from an overenthusiastic boy, whilst Keiko herself assures Chika their friendship won't be changed by Akemi being friends with them.