Where's the Perp?

Where's the Perp? (犯人はどこに？ Hannin ha Dokoni?) is the 4th chapter of the manga illustrated by Yasuhiro Kanō.

Synopsis
Back when Mao was still being chased by the boys, a suspicious figure noticed the mirror Mao placed on the back of the classroom and decided to have some "fun" with it.

In the hallway, students are relaxing with their friends when a creepy breathing sound carrying the mirror reflects one of the girls panties. Harisugawa is shocked by this and wonders who is using the mirror to take a peek and is disgusted by the perverted breathing the perp gives. As the perp closes in his next target, one of the girl notices the perp and tries to call out, but the perp quickly escapes. However the perp has no intension of stopping and continues to peek at the panties. As the images of panties keep showing up, Harisugawa becomes absorbed by it, so he punches himself to snap out from it. When he tries to call out to Mao, he notices that the window has disappeared and realizes that Mao could be targeted as well.

Meanwhile, Mao is startled by Saki who suddenly took a peek at Mao's pouch which she sealed the cell phone. While puzzled, Saki adds that she isn't a fan of Heart shaped panties. As Saki leaves, Mao asks if she is bothered by Harisugawa withdrawing from school. Where she replies that she is bothered as he disappeared on his own and stirring unwanted trouble. But reminds Mao that unlike Harisugawa who disappeared, she will stay by her side and dashes off.

After Saki disappeared, Mao opens the pouch when Harisugawa calls out to her in panic. Hearing the situation from Harisugawa, Mao rushes to the scene where she notices that there is no boy to be found. When Harisugawa checks, he sees that the perp is approaching Saki and Mao rushes to her side. When Mao knocks Saki, she notices a carton box wobbling where a dog holding a mirror shows up. Realizing that the perp was none other than a dog Mao is reliefed. But when she tries to grab the mirror off the dog, it's bark sends the mirror to between Mao's legs and reveals her panties to Harisugawa. While the man who originally took the mirror is frantically searching for it.