Moe-hime: Kyuuteihen

The time is the Heian Era. Tomoe is only interested in otaku things, and she is shy around people. So her favorite companions are the otaku youkai in nature. But when she learns that a famed doujinshi will be on display, she summons up all her courage and heads for the event at the palace. But unfortunately, a major incident occurs! The one who rescues Tomoe is Kiminto, an onmyoji… A story of new friendship full of moe and thrills!

(Source: Libre, translated)