KO One: The Sound of a Broken String

A warm reminder from someone from beyond the heavens:

Attention, everyone!

A little amnesiac girl from Miaojiang may drop into the woods, the hills behind town, the streets and alleys... or even your room, at any time! If you find her, feed her immediately. You might receive a grateful gift in return. You may not like the gift, but please don't hurt her or throw it away. We recommend carrying it with you. It might save your life when it matters most~

The story begins in the Iron Time and Space of the Ultimate series

[Everyone falls for her at first sight]

[You wouldn't guess it from her usual demeanor, but she's secretly a mischief-loving sort with her own code of conduct. She refuses to be constrained and does as she pleases, but she likes finding herself a caretaker. Her only criterion for choosing one is whether they catch her eye.]

[She has her own system of abilities]

[An absolutely stunning heartthrob adored by everyone, though not every relationship is romantic. There will also be familial and platonic affection.]

[No women fighting over men, plenty of romantic rivalry, adored by everyone]