Haru and Natsu, both non-human entities devoid of human experiences, find themselves under the care of scientist Masa after being abandoned by their previous owner. While Haru yearns to grasp emotions, human behavior, and the concept of love, Natsu grapples with the fear of desertion once more. As Haru embarks on a quest for understanding and affection, Natsu battles inner demons of pessimism and solitude. Together, they ponder repeatedly: what truly defines love?