Episode Title:
Great Detective Kotori! I'll Investigate My Big Sister!.
Episode Description:
Curious about whether the monsters that the PreCure fight are because of Hana's clumsiness, Kotori ends up tagging alongside a couple of Hana's classmates, who are members of a Cure Yell Fan Club, as they look around town for Cure Yell. When a Mou-Oshimaida summoned by Gelos attacks, Hana comes to Kotori's rescue, reminding her of when Hana helped her when she was little. Gelos attempts to fuel the Mou-Oshimaida with her darkness, but Kotori and the fanboys manage to negate it with their Asu Power, allowing the Cures to win.
