It is not uncommon for popular culture scholars to write conference papers, theses, or journal articles about niche manga or anime. If such a paper exists, you can locate it via academic databases:
If you wish to explore the series further, here are the key takeaways: yosino granddaughter 2
Echoes of the Past Core Idea: The protagonist (Yui, the granddaughter of the legendary Yosino) discovers a series of latent “memory crystals” hidden throughout the world. By entering these crystals she can relive, reshape, or extract fragments of ancestral memories. The mechanic works both as a narrative engine (deepening lore) and as a gameplay system (unlocking new abilities, altering story branches, and providing puzzle‑solving tools). It is not uncommon for popular culture scholars