Background information for the upcoming Linkage set in Operaseria World:

The young boy Raphael and his childhood friend Clara grew up together in the lower city.

With Clara taking care of the easy-going Raphael despite her grumbles and sighs, one day, Raphael was found to be the illegitimate child of a noble family and thus sent to live in a military academy to continue his family line, separating them both...

As if to persue him, Clara then enrolls in the nursing school next to the academy...