Honzuki no Gekokujou: Shisho ni Naru Tame ni wa Shudan wo Erandeiraremasen 3rd Season EP32 - The Abandoned Child of the Cathedral and Making Colors

Main is finally able to go home. Her little brother Kamil is born and she becomes even more determined to create books. That is when Main meets a helpful collaborator named Heidi, who is the daughter of an ink maker. Heidi is extremely curious and passionate, so she hit it off immediately with Main. They start to make colored inks through trial and error. Meanwhile, a baby is abandoned at the cathedral and Main and her attendants end up taking care of him.