Author: Kana Akatsuki

Illustrator: Suoh

Cover: Suoh

After the long-awaited return of the Spring Agent, Hinagiku Kayo, and the New Year's surprise attack against Summer and Autumn, the Four Seasons have formed a unique united front. While they have managed to overcome many challenges and difficulties, a new challenge has arisen. The Hazakura sisters have become the first double Agents in history.

Is it a good or bad omen? Summer has arrived and the story of the Agents begins anew.