Pagachu

Pagachu is a Japanese Original Video Animation (OVA) series that was released from June 19, 2023 to the present.

Characters
Pagachu is a naughty but cute mouse alien and a former spy of The Grand Yaka who came from planet Yaka to find the weaknesses of planet Earth so The Grand Yaka could use them to invade Earth. Whenever Pagachu reveals a weakness of Earth to The Grand Yaka, her enemy-turned-owner Chaniwa Rumina would always stop their invasion. She eventually became Chaniwa Rumina's pet in the 7th episode after she found out that the leader of The Grand Yaka lied to her about the mission and that he sent her to Earth just to get rid of her.

Chaniwa Rumina is a 13 year old (actually 19 years old due to suffering from a disorder that prevents her from ageing) girl living with her mother. She is the only one who knows that Pagachu is an alien but never really tells anyone about it since she knows that no one would believe her.