The Journey of the Red Spider Lily

In short, an accident gives the Red Spider Lily a mascot (or a lackey?) System, leading to a story about transmigrating between worlds.

As for the protagonist's personality, the Red Spider Lily is happy to help humans, but that willingness comes at a price. Once she's helped you, you'll become flower fertilizer and nourish the sea of blossoms. And she doesn't help just anyone. She only helps people she takes a liking to.

The protagonist isn't human. She's a naturally born monster, not a human who turned into one.

Current worlds: Onmyoji, Date A Live