Ötani Yoshitsugu has often been plagued with bad luck, often spending her evenings alone searching for four-leaved clovers, believing in the words of a book written by someone named Angel. One day, Yoshitsugu finds a four-leaved clover and becomes delighted, only to find her luck hasn't improved at all. Dismayed, Yoshitsugu puts the clover she found in an envelope addressed to Angel and resides herself to her bad luck. To her surprise, she receives a response from Angel, telling her how bad luck can often lead to good luck...