Rin Sakuma, an office worker in her mid-20's, enjoys her work at an event-planning company. When she gets the chance to head a new project featuring her favorite idol, she jumps at the opportunity. Her fortune takes a dive, however, when she hired a security company headed by Kotaro Irie, her ex-boyfriend from high school!Back then, Rin truly believed they were in love, despite Kotaro's fierce reputation as the son of a mob boss... but all that came crashing down when he cold-heartedly broke up with her, leaving her alone and traumatized to start dating ever again.Now reunited as adults, Rin can't help but notice how handsome he's become, and try as she might, she can't lie to herself about her lingering feels for him. As she tries her best to hide her crush, Kotaro suddenly drags her into a passionate kiss... and seems intent on doing more!!