Mio Nonohara (野々原 みお) from Koinaka (こいなか), based off 20 images from the game. Seems to not have any issues from what I've seen but was trained on some NSFW images so taking precautions against that is needed for SFW stuff.
Prompt:
NonoharaMio,brown hair,blue eyes,very long hair,low-tied twintails,ribbons,large breasts,flower hair ornament