The title translates to 'League of Gentlemen', which owes to 英雄聯盟 that is the chinese name for League of Legends.
Sources are between http://www.pixiv.net/member_illust.php?mode=medium&illust_id=22620143 and http://www.pixiv.net/member_illust.php?mode=medium&illust_id=53161547