I haven't exactly memorized the main story, but I know the (reissued) events tend to focus on brief character development arcs, or just short stories about festivals, political incidents, stuff like that. The current event is a Sherlock Holmes-inspired thing. A lot of the main story also ties into the origin story of the pests, how the southwestern corner of the map was destroyed, and the whale airship. The quality varies, thought Nazuna genuinely being mistaken for a baby whale was pretty funny. The game seems to think she's fat for some reason. Might have to do with how she sometimes shows up as a parade balloon.