/jp/ - Otaku Culture

Both, obviously. But the diversity of content probably played an important role. That and being an original doujin series instead of being based on another one

Characters are diverse with interesting designs, and being girls of all ages with powerful abilites it's perfect for making cute, lewd or epic artworks.
As for music, there's so many of them, some are very joyfull, some are epic, some are both. They can be arranged in almost every genre possible.

Absolutely Glorious