Hidamari ga Kikoeru: Koufukuron  

Because of the immense popularity of "I Hear the Sunspot," its follow-up novel "I Hear the Sunspot: Theory of Happiness" is now available. What will happen next in this "more than friends but less than lovers" romantic relationship?

Hidamari ga Kikoeru: Koufukuron was published in English as I Hear the Sunspot: Theory of Happiness by One Peace Books on February 13, 2018.