Four characters from Higurashi Yoigoshi. It has both manga and visual novel version. It is a spinoff story that happens 20 years after one of Higurashi bad ends (specifically, Rena exploding the school). It starts as a horror, but is actually just sad. A sole survivor of the original cast is still around, wandering the ruins of Hinamizawa and mourning, while also dealing with some yakuza crap. While four characters die in this story, only one of them can be called a victim, and he's not in this pack. I don't know if Chiaki and Machi appear in the visual novels. As there are no colored illustrations, I don't really know what their colors are, and Chiaki appears way less than Machi in the short parts where they appear.

Sonozaki Mion: Yoigoshi, Mion, green hair, hair up, green eyes, mature female, medium breasts

Sonozaki Shion: Yoigoshi, Mion, green hair, long hair, green eyes, mature female, medium breasts

Towada Yae: Yoigoshi, Yae, pink hair, short hair, green eyes, medium breasts

Machi: Yoigoshi, Machi, ponytail, long hair, dark hair, curtained hair, greyscale, monochrome, small breasts

Chiaki: Yoigoshi, Chiaki, long hair, light hair, wavy hair, greyscale, monochrome, medium breasts