Yurikago no Otome-tachi

"S" means where your heart is. It's about a special girl (or person). The setting is Taisho era. At a high school for girls, "S", a special relationship between upperclassmen and underclassmen, is in vogue. Since the start of the school, Tamaki, a talented young woman, and Yukiko, the daughter of a soldier, are supposed to be developing a normal friendship that is different from "S", but—? (Source: Amazon, translated)