Miira no Kaikata

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!

(Source: Crunchyroll)

Miira no Kaikata is simulpub in English as How to keep a mummy by Crunchyroll.