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A brief summary of what's going on in this file:

Aww, well we are girls. We have the right to act grumpy and all XD

Yes it is! ----------------------------------------------------------------------------------------------------------------------------------------------- The trick uses pressure manipulation to draw water into the toilet at a high enough level to drown the victim. It is effectively a scaled up version of the chemistry/physics demonstration where a burning candle is covered with a pitcher so that the candle is in an air-tight space sealed by the water at the ground. You can see a video of it in action , and an explanation for how it works here. The culprit uses a stun gun on the victim while he is in the toilet, giving him a burn mark on his left shoulder. The culprit repositions the victim so that he is bent over double with his head between his knees. This posture puts a lot of pressure on the front of the stomach, giving him pressure marks on the front of his abdomen. (Or maybe the culprit looped his belt through something so he can't stand up. I'm not sure because I didn't see anything damaged by him trying to stand up.) The culprit then seals the upper vent on the back of the toilet and the area around the doors with waterproof tape so that it is airtight. The ventilation space at the base of the door is not sealed. The kerosine in the four cans are lit and set up on the toilet paper rack. The heat and soot leaves a large burn mark on the ceiling. The culprit then uses a towel to plug the drain outside so that water rises in the subsided area by the toilet. The water rises and leaves diagonal lines corresponding to the high water mark on the walls by the toilet. Once the water is high enough, it is pulled into the toilet per the pressure explanation above, drowning the victim, getting water in his lungs, and soaking his clothes and wetting the lower part of the toilet's walls. The water subsides a little over time, but drains rapidly once the culprit removes the tape seals while everyone searches for the victim at bars nearby, leaving behind a sticky water-repellant residue on the edges of the vent and door. This tape is hidden somewhere convenient, like in a car. The sopping towel clogging the drain is also removed and thrown in the trash so the water can drain away, and Conan hears the gurgling sound of the water draining in the parking lot while looking for the victim and wonders what it is. The culprit then enters the drained toilet, props the victim upright, and throws the four cans of kerosine in the trash, dumping whatever is left in the drain outside. The culprit, the science teacher Masaki Sunami, can now find the victim. Masaki is the culprit because she went to the car to put him in, the ideal time to stun gun him and set up the trick. She other woman pointed out it had been raining the last times they had come to the bowling place, something the culpit would not want to point out. Masaki also knew it was raining the whole time, meaning she was paying attention to the weather: it had to be raining hard in order to fill up a corner of the parking lot high enough for the trick to work. She also found the body, giving her the best opportunity to remove the kerosine cans and prop up the victim. Finally, as a science teacher, the candle pressure demonstration is her area of expertise.