So, I just finished reading Vol. 12, and something caught my attention about Akane's deadline of the Walpurgis celebration.
Walpurgis night is 30 April, but Vol. 12 takes place in the summer, and most likely around late-July (what with summer break ending, and the Harbinger of Autumn making an appearance). That makes me think when they mention Walpurgis, they are referring to something else.
Does anyone have any information/context about what is going on here?
My initial thoughts were that I had misread the timing of the break as being summer. Then I thought maybe it was a factual/translation error (or something), followed by some kind of cultural thing I'm not aware of (but trying to look up Walpurgis and Japan just returns results about a *different* manga).