Sudden Love Letter?! Pull Yourself Together, Ezet!

Synopsis

Ezet trains in the early morning to toughen himself up. Then he suddenly feels someone's gaze on him. He feels the same gaze several times at the Academy and stays on alert—until one day a mysterious letter is left in his locker. Suspecting it might be related to the strange gaze, he goes to check the contents, when a Kuroko accidentally gets the letter wet. From the little that's still readable, he pieces together the unimaginable: it's a love letter?!