Volume 6 starts off with a cute picture of Chitangelion, and just gets more wacky from there :) Kaizou's class goes on a field trip and meet the Swiss people, Chitan sleepwalks his way onto a midnight man-train, Umi experiences a shoujo manga crisis, and Chitan wanders around dressed as a Frenchman ^_^
The chapter titles are as follows:

1: Igai ga Sukimono:
2: Gitagita heart no Komoriuta:
3: Hishou Hishou Banashi:
4: Haisenkara ai wo komete:
5: Ban tou bi uirudo: Born to be Weird
6: Kiseijin raishuu!:
7: Daiya no 6 ga detekonai!:
8: Kotoshi no Shishuunki!?:
9: Itsuka girigiri suru hi:
10:Jinrui, Tsuki ni naru!?: Mankind, Become the Moon!?
11:Torauma Ddokkomura