That one requires a girl to be under 60 relationship with Ryen and given a love potion. The way i know how to get it is to give Tsubaki the love potion you get at the Academy at the beginning of the game. Sorry i can't be of more help.
https://renryuu.miraheze.org/wiki/Raids down near the bottom shows you what items are needed to make what item. It is random each time.