Ame Agari no Neko-tachi e

This story begins in 1990. Hitomi and Hoshibana lead the lives of 2 ordinary high school girls. Hoshibana, having distrust for all men due to a prior traumatic experience, falls in love with
Hitomi. With these complex emotions, Hoshibana continues seeing Hitomi, until one rainy day, she confronts Hitomi with her feelings. Suddenly, an accident occurs... They're buried alive in a landslide! A monument is built for these two at the school; the sorrow for these two continues...

[From gamelexgs]