After pursuing a workplace romance, Satsuki married Seiichi. Jealous of her happiness, her former colleague Kyohei—whom Satsuki had previously rejected—plots to win her affection by any means necessary. Deceptive and lacking integrity, Kyohei disguises himself as an insurance salesman to get close to Satsuki, determined to make her his own. As his twisted love and obsession unfold, a gripping narrative draws readers into his disturbing pursuit.