Kaijuu Girls: Ultra Kaijuu Gijinka Keikaku
English title: KAIJU GIRLS
Japanese title: 怪獣娘[かいじゅうがーるず] ~ウルトラ怪獣擬人化計画~
Type: ONA
Source: Original
Episodes: 12
Status: Finished Airing
Aired: Sep 27, 2016 to Dec 13, 2016
Duration: 5 min per ep
Rating: PG - Children
Studios: Studio PuYUKAI
Producers: Pony Canyon, Tsuburaya Productions, Docomo Anime Store, Links
Genres: Comedy, Fantasy
Themes: Parody

Very rarely is a girl born with two distinct souls: one of a human and the other of a kaiju. These extraordinary individuals, dubbed "Kaiju Girls," possess the form of a normal person and the supernatural abilities of a giant monster. The International Kaiju Rescue and Mentoring Organization, also known as GIRLS, was created to help these Kaiju Girls adjust to their powers and find a place in society. 

Recently, three young girls have awakened their kaiju halves. The introverted Aki Miyashita obtains the soul of Agira, the serious Reika Shiragane inherits Windom, and the energetic Miku Ushimaru receives Miclas. Together they join the organization GIRLS, where the three each learn how to use their powers and control their monstrous instincts. Through the support of those around them, Agira, Windom, and Miclas each discover what it truly means to be a Kaiju Girl.

[Written by MAL Rewrite]

These shorts are part of the Ultra Monsters Anthropomorphic Project, a moe anthropomorphism project made by Tsuburaya Productions based on past monsters/aliens that have appeared in Ultra Series. (Source: Wikipedia)