Bloody Sugar Wa Yoru Warau summary:

Nega - a bizarre disease that develops by acting on the negative emotions of human beings. Symptoms vary from person to person and cannot be seen by ordinary humans. Church and Jed are unalike brothers whose livelihood are doctors who specialize in Negas. The two are looking for a certain nega for their beloved sister, Basil ...!?A dark sweet fantasy presented by the most notable writer, Matsuri Mido!