The anime already premiered
The official website for the anime adaptation of How to Keep A Mummy has uploaded a new promo for the anime, which premeired yesterday.
Crunchyroll describes the story as follows:
“When high school student Sora Kashiwagi finds himself staring down a mysterious oversized package sent to him by his self-proclaimed “adventurer” father, the last thing he expects is for it to be opened from the inside... by a little mummy so small it can fit in the palm of his hand!”
Via: Anime News Network