At Tennomifune Academy, a prestigious school known for its exceptional students, lies Class 1-7, also known as the 'Happiness Class,' where students dealing with personal struggles are given a chance for growth and happiness. An Hanakoizumi, Ruri Hibarigaoka, and Botan Kumegawa, each battling their own challenges of misfortune, love troubles, and poor health, enter this unique class after gaining admission to the school. Together with their classmates, they strive to conquer their individual obstacles and seek a brighter, more fulfilling future.