Despite being a colorful setting with equally colorful and silly characters, this doesn't exempt ATTACK on MIKA from having its scary moments, especially when the situations depicted in these stories can happen in the real world.
- Creepy sister...
: After Himeka kills Kotomi's dog Ron with weed killer, she starts making twisted facial expressions reflecting her true self. After Kotomi moves to Hokkaido with Aunt Takako and her pets, the story ends with the shot of a malnourished Himeka flashing a creepy grin as she holds a lighter, with a torn-apart teddy bear at her feet (implied to be hers), preparing to burn down the house. The mother's reaction says it all. What's more, Kotomi herself even told her mom that Himeka was like this since she was little.- The fact that Himeka is malnourished in the first place implies that her parents started abusing her after Kotomi moved in with Aunt Takako.
- The ending is even scarier in the original Japanese version due to the music, the special effects, Himeka referring to herself in third person, and the mother's Big "NO!" sounding more frightened.
- The fact that Kotomi fell into depression after Himeka killed her dog and their mother neglected her. Had Aunt Takako not intervened, Kotomi would have either died of starvation or at Himeka's hands.
- "My sick and coddled sister said she wanted my boyfriend...": Since she was little, Kasumi smiles with solid black irises at her sister Masumi whenever she mocks her about how their parents are on the former's side.
- Even as an adult, she still smiles like this when she declares she wants to take Masumi's boyfriend Ren as her own.
- "Twin sister kicks her down the stairs... But it doesn’t stop there...": After Saki was pushed down the stairs, Gozumi faked being concerned with the former's injuries despite being the one who pushed her down the stairs because her crush, Iketa, asked Saki out. After being entrusted with tending to Saki while she recovers, Gozumi terrorizes and tortures her for "stealing" Iketa from her.
- The scene where Gozumi carried a still-recovering Saki in a wheelchair out of her room and threatened to push her down the stairs again if she didn't break up with Iketa. The twisted expression on the former's face while doing so doesn't help matters. If Iketa had not intervened, Gozumi would have probably hampered Saki's recovery or murdered her.
- This scene from the episode "My elementary teacher went missing over summer break. 10 years later…" is pretty bone-chilling: Ms. Midorihara flashes a Nightmare Face at Hiroki and starts to act predatory towards him, even going as far as chasing him down the streets. Even when it turns out to be an act to ease Hiroki's guilt for accidentally ruining her life, it's still scary for those who were victims of stalking/sexual assault in the streets.
- "Parents go on a week-long vacation with only their favorite daughter...": The Uchidas have Saki locked up in the veranda for talking back to them on taking only her sister Yuki on vacation. Hearing a frightened Saki plead to not be locked in the veranda while the couple gloats about it is nightmarish enough, but knowing the trip lasts one week, Saki would be drastically emaciated or dead by the time it ended, had resident delinquent Yuto not saved her.
