La felicidad? No s qu es. Nanoka Koyanagi es estudiante de primaria y le encantan los libros. No tiene amigos en la escuela, pero ha trabado amistad con una anciana amable, la hermosa Fulana y una adorable gata de cola corta. Un d a, en unas ruinas que descubre por casualidad, Nanoka se encuentra con alguien inesperado. An unhappy girl who engages in self-harm, a woman ostracized by society, and an old woman looking to live out her twilight years in peacewhat could three such different people have in common? Thats what grade schooler Koyanagi Nanoka is trying to find out. Assigned by her teacher to define what happiness means to her, Nanoka sets out to get to know these three strangersand through them, perhaps, to know herself too.