Eating by yourself doesn't mean you're lonely. Your lunch, lovingly made for you, is a source of comfort. Geeky Haru is used to disregarding the curious stares of strangers who don't get her values. However, a chance remark leaves her feeling blue. That same day, she crosses paths with the androgynous Ao. The two hit it off and impulsively decide to live together. However, they have a unique rule: exchanging homemade lunchboxes!