Withers/theories

Yakitsuki is a photographer
One effect that Yakitsuki can get is a camera that lets her take photos. There is also a board in her room that fills with photos as she collects effects. Both of these things suggest an interest in photography.

Nature could be Yakitsuki's subject of choice when photographing, as the Camera effect is found in a burnt down forest, as well as a number of the dream areas (Clover World, Dark Mushroom Forest, Wilderness, etc) and effects (Mushroom, Flower Vase) being related to plants/nature.