As Valentine's Day approaches, Grell Sutcliff, the grim reaper, finds herself at the center of a harem battle. While preparing chocolates for her butler, Sebastian Michaelis, a group of charming men crash through her window, disrupting her plans. The first to arrive is fellow reaper, William T. Spears, who offers only criticism. However, the group grows to include Phantomhive servants, Chinese trading company manager Lau, Viscount Druitt, the Queen's butler, Ash Landers, and even the royal duo of Prince Soma and Agni. Amidst the chaos, The Undertaker arrives as "The Valentine's Fairy," escalating the situation into a romantic fiasco.