Kimihiko Kimizuka (VA: Arata Nagai)
An 18-year-old high school student. Born with a natural knack for getting dragged into trouble.
Fought against SPES, the enemies of the world, as the assistant to the ace detective Siesta.
After her death, he grew fully accustomed to a lukewarm, ordinary life. However, meeting Natsunagi and learning the truth behind Siesta’s death inspired him to stand up as an ace assistant once again.
Siesta (VA: Saki Miyashita)
Her real name and age are unknown. A beautiful and flawless ace detective shrouded in mystery.
She waged a mortal battle against SPES, the enemies of the world, together with Kimizuka, and lost her life a year ago. Yet even from beyond the grave, as though she had anticipated her own demise, she reaches out to Kimizuka and the others through a certain method.
Nagisa Natsunagi (VA: Ayana Taketatsu)
A girl in the same school year as Kimizuka. Highly passionate by nature, her emotions are directly shown in her expressions and behavior.
She first met Kimizuka as a client, and carries Siesta’s heart in her chest while hiding a profound secret in her past.
Troubled by her own origins, she faces a test of resolve to truly inherit the ace detective’s legacy.
Yui Saikawa (VA: Kanon Takao)
A 14-year-old middle schooler and national idol. Her left eye is a sapphire prosthetic that can see through anything.
Although usually bright, carefree, and mischievous, she lost her parents early in life and sometimes shows a surprisingly mature side.
After Kimizuka and his allies solve a case that befell her, she ends up joining their group.
Charlotte Arisaka Anderson (VA: Saho Shirasu)
A 17-year-old girl with roots in both America and Japan. Siesta’s disciple and a soldier with exceptional combat skills.
She idolizes Siesta and calls her “Ma’am,” and she views Kimizuka, Siesta’s beloved assistant, as a rival, treating him as an enemy right after their reunion. After a fierce battle against SPES, she joins Kimizuka and the others in carrying on the ace detective’s legacy.