The Refreshing Battle of Karuizawa! Ôran kôkô hosutobu : Season 1 Episode 15

During summer vacation, Haruhi gets a part-time job in a pension at Karuizawa. She feels guilty at first for not saying anything to the rest of the Host Club, until they drop in unannounced. A contest erupts when they realize there is only one remaining room at the pension. Hikaru and Kaoru win by using their brotherly love act. When Haruhi's middle school friend visits, things take a turn for the worst.