Office worker Mamiya's life is turned upside down when her kind-hearted but overweight friend Teshihara returns from a year-long assignment, looking like a completely different person. To her surprise, he confesses his love for her, overwhelming Mamiya with his affection. As she struggles to come to terms with this new development, Mamiya must navigate her complicated feelings towards Teshihara, all while maintaining their platonic relationship. Will she be able to handle the weight of his confession?