Shop owner and manager of Rokuhou-dou. His first name is actually Kyousui, but he is fondly called Sui by everyone. He quit his office job to reopen the tea house he inherited from his grandfather. He learnt the art of tea making from his grandfather and is now a tea expert. His tea is known to have a relaxing attribute and is easy to drink too. Though he seems pretty clueless at times, he is pretty sharp and level headed at others. Although his tea is excellent, he totally sucks at cooking, and as such, his cooking is feared by everyone. He is a big fan of cats, and has a pet cat named Kinako at home, which was a stray he picked up. He is not really on speaking terms with his twin brother, whom he wants to make up with.