Captain-whose-name-I-Am-Forgetting-Right-Now mentions "Gun" Shellfish, and how they were named after guns who would misfire. So while firearms haven't reached the region yet, they very much exist and are in use elsewhere.
Isn't "Lushia" meant to be "Rushia"? From the way they describe it, it´s "Even further north-east than the northern provinces", "on the edge of civilization. It's an incredibly cold place" it sounds like it's meant to be analog Russia.
OH BOY, HERE WE GO
Prepare yourself for potentially unsatisfying cuck resolutions on the name of maturity. Yamada's sheer love for her acting career and the source material, and Ichi's doormat self-sacrificing personality (that has not been acknowledged by the story as a bad thing so far) could...
This manga is paced like it is five chapters away from getting axed, every single chapter. The blurry lines between the afterlife, time and space are really interesting.