Voiced by: Yuki Ono
- Butt-Monkey: He is often beaten up by his "friends".
- Chivalrous Pervert: He has a weakness for cute girls, but is a decent guy at heart.
- Determinator: Shown off during the first puzzle room. He will not quit until he stops breathing.
- Has a Type: He is attracted to Meido and Meganekko girls. Less scrupulous characters often turn this against him.
Voiced by: Rui Tanabe
- Action Girl: Beats the tar out of Juugo in the first episode and was a treasure hunter when she was still alive.
- Gamer Chick: Her favorite pastime is to lounge around her room and play video games.
- Ghostly Goals: She cannot pass on to the afterlife until she finds out who did her in and returns the favor.
- Murderous Thighs
- NEET: Justified since she cannot leave her bedroom and has no real way to do anything productive. All she ever does is lounge around, eat pudding, and play video games.
- Older Than They Look: She's chronologically in her mid-twenties, but looks and acts like the teenager she was when she died.
- Plot-Triggering Death: One of the main mysteries of the series is to figure out who killed her.
- Rapunzel Hair
- Trademark Favorite Food: She really likes pudding. Her favorite brand is Randoya Light Pudding.
Voiced by: Kana Asumi
- Awesomeness by Analysis: She manages to solve the first puzzle room through sheer analytical skills.
- Cute Little Fangs: She has a small fang on the left side of her mouth.
- Great Detective: Considers herself to be one.
- Nice Hat
- Red Oni, Blue Oni: The bombastic Great Detective wannabe to Daruku's Shrinking Violet.
- Shameless Fanservice Girl: She has no compunctions about stripping to her underwear in front of Juugo.
- Teen Genius: Despite her youth, she is an incredibly intelligent detective.
Voiced by: Kana Hanazawa
- Costume Inertia: Tensai initially has him dress as a maid to take advantage of Juugo, but he continues to wear the outfit for most of the series.
- Meido: His casual outfit is a maid's uniform.
- Red Oni, Blue Oni: The Shrinking Violet to Tensai's bombastic Great Detective wannabe.
- Shrinking Violet: He's rather meek.
- Unsettling Gender Reveal: Juugo is not happy when he discovers that Daruku is a guy.
- Wholesome Crossdresser: He's biologically male, but always wears women's clothing.
Voiced by: Kazuyuki Okitsu
Voiced by: Eri Suzuki
Voiced by: Mamiko Noto