Mune ga Naru no wa Kimi no Sei
胸が鳴るのは君のせい
The narrator has shared mutual feelings with someone for two years, though the other person was unaware. Despite this, the narrator has consistently loved them. The series includes additional one-shots: one titled "Bye Bye Regret" in Volume 2 and another called "Koisuru Usotsuki" in Volume 4.
