She is a main heroine of "白い蛇の夜 (Shiroi Hebi no Yoru)".
This game is one of the followers of Leaf's old masterpiece “痕 (Kizuato)”.

https://vndb.org/v6183

This was not a well-known VN, but it was popular with a certain segment of VN gamers and I liked this game.

Recommend strength is 0.7-1.0.

You may also add “retro artstyle, 1990s \(style\) or 1980s \(style\)” if you like.

default outfit:

Kamishiro_Ren, 1girl, medium breasts, green eyes, red hair, short hair, bangs, hair between eyes, sidelocks, school uniform, serafuku, white shirt, short sleeves, sailor collar, blue sailor collar, neckerchief, yellow neckerchief, blue skirt, pleated skirt, miniskirt, kneehighs, black legwear

buruma:

Kamishiro_Ren, 1girl, medium breasts, green eyes, red hair, short hair, bangs, hair between eyes, sidelocks, gym uniform, long sleeves, blue buruma, kneehighs, black legwear