Himeno Towa (姫野 永遠) is one of the heroines in Soreyori no Prologue.

https://vndb.org/v15637

Many of the event CGs in this game appear to have been processed with strong saturation to evoke the feeling of midsummer sunlight, making it difficult to learn the correct colors. I never imagined that LoRA training could be hindered in such an unexpected way. By combining the color images with monochrome-converted versions of the event CGs, I was able to somewhat counterbalance the effect and achieve a more subdued color tone for training.

Also, for some reason, it sometimes ends up with "short hair," so when that happens, try emphasizing "long hair, very long hair" while including "short hair" in the negative prompt.

Himeno Towa, 1girl, purple eyes, long hair, very long hair, black hair, ahoge, hair ribbon, white ribbon, hairband, white hairband, school uniform, blue serafuku, orange ribbon, white skirt, thigh, white thighhighs