A Dead End Cafe in the Royal Capital Kakurega

Mai Sasaki, who lives in Tokyo, was supposed to end her life due to illness. However, just before she died, her grandmother bestowed her with magical knowledge and powers, and sent her off to another world. Now that she is healthy again, Mai resolves not to waste the life she has been given, and opens a cafe called "Hideout" at the end of the royal capital. Henry, the castle's top civil servant, who frequently visits Mai's "Hideout," seems to have a secret...

(Source: Natalie, translated)