The 4 main women from Kyonyuu Dosukebe Gakuen. Someone else already made a character pack of them in their visual novel style, I like it and I raise to you this one, which uses the same art style as the animation.

Prompt for Reika: kyonyuudosukebegakuenpackhstyle, Reika, blue hair, long hair, bangs, purple eyes

Rune: kyonyuudosukebegakuenpackhstyle, Rune, yellow hair, long hair, hair ornament, pink-colored bobbles, two side up, blue eyes, (tan skin, dark skinned female)

Tamaki: kyonyuudosukebegakuenpackhstyle, Tama, pink hair, purple eyes, black bow, single pigtail, one pigtail

Nao: kyonyuudosukebegakuenpackhstyle, Nao, blonde hair, short hair, bangs, yellow eyes, brown glasses, semi-rimless eyewear, semi-rimless glasses

Other possibly helpful positive prompts: high quality, high resolution, 1girl, solo, single

Negative prompts: low quality, low resolution, blur, blurry

All sample images use 25 steps, Euler A, 5 cfg scale, and the latest version of WAI Illustrious.