Reiko Akutsu works for a residential construction company. She plans a lunch matchmaking meeting to find love with someone in the same company. New employee Yuika Amano offers to join the matchmaking event. Yuika and Reiko hold the luncheon and meet two men. During their lunch, Yuika and Reiko hear a story filled with riddles by the two men. Yuika can't help but to solve the riddles. Going forward, during their lunch matchmaking meetings, Yuika hears various stories involving things like ghosts or missing people and she attempts to solve the mysteries.
