Single wedding planner Rinka reluctantly joins a dating app, gets matched with a suspicious man. Murder cases emerge involving app users as victims, and her date comes under investigation for the serial killings.

Rinka Tadashima is single and works as a wedding planner. She is not good with dating men. Her colleague suggests to her to try a dating app. Rinka reluctantly registers with the dating app and gets matched to a man. When they meet, the man has a totally different appearance from his picture on the dating app. He seems like an ordinary man, but Rinka feels something is not right about him. Meanwhile, a series of murder cases takes place. The victims were all users of the dating app. The man that Rinka met through the app is investigated for the serial murder cases.