Watanabe Ryuuji

Ryuuji is the owner of Cafe Lindbergh. He is the second-generation leader of the Watanabe Group which runs a chain of Italian bistros. He has been friends with Itsuki since school days and having high trust in Itsuki's abilities and thinking of him as a personal advisor, he asked him to manage Cafe Lindbergh. He occassionally stops by to check on the shop.