Sakurako-san no Ashimoto ni wa Shitai ga Umatteiru (Beautiful Bones -Sakurako’s Investigation-)
The novel series revolves around Shōtarō Tatewaki and Sakurako Kujyō. Shōtarō is a normal high school student with a serious demeanor who likes to show off his girlfriend Sakurako. Sakurako is an extraordinarily beautiful woman in her mid-20s from a rich family who loves "beautiful bones." The two live in the city of Asahikawa in Hokkaido, and they get involved in various incidents regarding bones.
[Source: Anime News Network]