After a long battle against monsters, humanity has finally entered an era of peace. It is in this era that on Earth, girls have been born with the souls of monsters. These girls, who posses the ability to transform into monsters, are known as Unidentified Mysterious Girls - Kaijuu Girls.

This is the light-hearted tale of the strong, ephemeral and beautiful Kaijuu Girls, who shoulder an unfortunate fate.

Agira (Aki Miyashita)

Voice Actor: Riho Iida

Quiet and plain, she dislikes standing out. A typical modern-day teenage girl with no hobbies or interests. She’s bothered by the fact that she has a mean-looking face and always looks like she’s falling asleep.

Miclas (Miku Ushimaru)

Voice Actor: Aina Suzuki

An ultra-healthy girl who’s never caught a cold in her life. A so-called muscle head who acts before she thinks. A fan of Daikaijuu Fight, a sport where Kaijuu Girls fight each other.

Windom (Reika Shirogane)

Voice Actor: Yurika Endou

Serious about everything with a strong thirst for knowledge. She’s actually a hardcore otaku and fujoshi, the type who supports her favourite works and characters with all her heart.

Pigmon

Voice Actor: Sora Tokui

Pigmon functions as a sort of leader to the GIRLS while also being somewhat of an idol at the same time. Regardless of whomever her partner is, she tends to do things at her own pace and her smile never fades. However, if it ever does disappear, she pulls a great power from deep within her.