This work's theme is "adults with chuunibyou".
 "Chuunibyou" is an easy word to toss around, but understanding that as a motif isn't so simple. I think the source of it is how people tend to think of their childhood as embarrassing, as part of how they progress from a state of innocence to adulthood. 
 In becoming an adult, one becomes different from their past self, and in that same vein, different from those around them. As a result, they think for no reason that they're an utterly unique individual.
 If you consider it this way, "Agh, my cursed right hand is~" or "I can whisper into your mind~" and so on aren't really the core essence of chuunibyou. 
 The true nature of chuunibyou is the heat of life.
 It's an explosion of one's imaginative power.
 It's a form of resistance against a chilled society, wielding both purity and creativity. 
 Lately, I've been thinking: how can I maintain my chuunibyou until the day I die?
 If I can do that, I can enjoy sake for my whole life. 
https://en.touhouwiki.net/wiki/Dateless_Bar_%22Old_Adam%22/Story