A photo was sent to Kuromi.
It was a photo of her sister Romina, who had gone missing.

Kuromi is desperate to see her sister again!

Will she be able to find Romina?

[Source: official website]

A young girl named Miru and Ran, a boy who appeared before Miru, embark on an adventure in an alternate world — but something tragic awaits them there...

[Source: Anime News Network]