This is Paralogue 19, and focuses on Lutz. It is unlocked by S ranking Harold/Arthur (from now on, just Harold). It is on the Nohr and Touma paths only.
As usual, this is all done on my free time, and takes awhile. It can be a lot of work, but I do hope you enjoy! I am unemployed… so please consider donating if you like the work I do. : ) It certainly helps me keep going!
You can find data on the chapter itself here under “Paralogue 19” [P19] here.