The Zen Club is the 289th chapter of Urusei Yatsura manga. After a fight during Onsen-Mark's class becomes destructive and Ran's explosive dolls destroy half of the school, the Principal cancels school, and as punishment makes Ataru, Lum, Mendo, Ran, Shinobu, and Ten go to a Zen retreat and meditate. What the principal did for some peace, ends yet again in a mess and the zen temple is left in pieces just like Tomobiki High School.