The series follows the heartwarming relationship between Amane Fujimiya, a high school student, and his beautiful neighbor, Mahiru Shiina. Mahiru, who is known as the 'angel' of the school for her kindness and beauty, unexpectedly starts taking care of Amane. As they spend more time together, both Amane and Mahiru begin to open up about their personal struggles, leading to a blossoming romance. The series explores themes of love, friendship, and personal growth.