When clouds in the sky and falling rain tease the two close friends in trouble, Rei and Kai, it takes them to meet Arashi and Fuma, who are not only cunning saviors but also guys making storms in the two best friends’ hearts. The war of love is about to take place in the warm spring, hot summer, lonely autumn, and cold winter. How would the atmosphere of love be? Which way would their hearts wave, and the air full of love take them?
Okawa Yuka is living out the daily motions of life but doesn't understand her reason to keep living. After a confrontation with a co-worker, she decides to end it all but fails when she stops herself from squishing a cicada. That cicada returns the favor by transforming into a man, named semi, for seven days because he thinks it will make her happy. The downside is, he has no idea how to live as a human.