Momo-chan, Mari’s closest friend and schoolmate, habitually joins her in detouring around Fear’a Bridge to accommodate Mari’s deep-seated fear. Their routine fractures when Momo-chan’s uncle gifts her a dog, obliging her to walk the pet each morning via the bridge. This shift forces Mari to journey to school alone, inadvertently nudging her toward confronting her phobia of the bridge and aversion to foods like carrots and peppers. Momo-chan’s dedication to her dog underscores her growing responsibility but strains her bond with Mari, serving as a pivotal trigger for Mari’s emotional growth. When the dog later vanishes temporarily, Momo-chan’s distress and determination to find it reunite the friends, mending tensions through their joint efforts. The narrative remains focused on these interactions, without elaboration on Momo-chan’s external background or expanded media appearances beyond the original film.