What does a man have left after his father has gone missing, and his ex-girlfriend heartlessly broke up with him for seemingly no reason at all? An empty heart that lives through a monotonous everyday life. “Meeting you changed my world.” The fateful encounter got our story’s MC, Hirase Tatsuya, involved in something that could shake the whole country, or even the world. Come and unravel the secrets behind the MC’s missing father and all the unexpected bittersweet encounters with the girls.