Laugh Attack

Synopsis
Suki is trying to figure out why Yuka is so depressed. Umiki & Ezuka then tells her that he was on the phone with his father in the morning and that his father is very disappointed with him and his grades. Suki wanting to make him feel better, tries to get him to laugh. Weapon X then plants a gas in the auditorium where everyone is. After the principal finishes his speech, the gas activates and everyone (except Yuka, Ozu, Suki, Yuma & Tumalu) are infected with the laughing gas. Ozu tells Umiki to keep the place shut before all the laughing gas spreads throughout the school. When they go to the science lab, Mrs. Cramer & Ned Collin is there and so Yuma threatens them both. As they are researching, Yuka notices the gas coming in and so he grabs Suki & Yuma and escapes. He then goes back to get Ozu but it is too late. Tumalu then barely manages to escape but injures her kneecap. The four then goes to the dorms and tries to find out what is going on. Suki asks why Yuka is so angry but Yuka does not answer and leaves. Yuma then tells her that she should have never asked that and Tumalu then looks out the window and nervously states that the gas is trying to find a way in. Yuma and Suki then thinks that Yuka will be contaminated as well. When they race out to get him, they notice that he is nowhere to be seen and Yuka comes down from the infirmary to find Suki laughing like crazy. Yuka then saves Yuma and the trio then goes to the infirmary. Yuka then remembers that to eliminate one smell, you have to counter it with a smell even stronger. Tumalu then points out the sewage tank. Yuma is disgusted and decides to stay in the infirmary. However, she is quickly turned into a laughing zombie when the gas comes in through the air vent. Yuka and Tumalu reaches the tank and tries to bust it open. However, it fails and Tumalu then gets infected. Yuka then runs inside of the sewage tank building and grabs a pipe and fills it. He then puts on some of the extra clothes and manages to break for the auditorium. He then clears the room out but notices that it is not strong enough. He then connects the air vent with the sewage pipe, cleaning it out and healing everyone in the school. Everyone is then forced to take a 2 hour shower each. Yuka then gets thanked by the principal and the gang then asks why he does not have to take a shower. Yuka then says that he was never hit with the sewage as he was wearing different clothing.