Very few youkai or spirits become active during spring, but one of them is this fairy, Lily White.
Lily herself finds it easy to sense the season changing to spring, but this is difficult for others to do.
She is not aggressive despite her actions seeming so. Even so, it is best not to disturb or attack this fairy. She is strongest during the spring.
She is called "the Voice of Spring", as you will not see her often besides during Spring. There is poetry dedicated to her as well.
It seems Lily always appears from the west and disappears towards the mountain. No one has apparently seen her coming from the other direction. There is speculation that she might be getting eaten by the mountain youkai.
Or, more realistically, she might have gone around the world.
Lily apparently has good relations with humans, as she does not seem willing to attack even if they catch her. Likewise, humans do not see her as a threat, but rather as a symbol of good luck.
Lily does not attack often, but when she does, it's when she is extremely excited about spring being here. When she does attack, it is advisable to get away immediately.
She will not leave an area where the season is becoming spring, so it is recommended that one leaves when she is attacking.
If you leave flower seeds behind, Lily will have fun trying to make them bloom, which makes her very popular with florists.