Habahiro Hige, an unassuming elderly man working in an office, finds himself the target of his mischievous 24-year-old coworker Iori Wakabayashi's teasing. Iori cleverly uses his love for Tabekko Marshmallows to play pranks on him, from flaunting them in front of him to sabotaging his access to them. Despite the confusion of their peers, Iori is captivated by Habahiro's soft, marshmallow-like appearance. Unbeknownst to Habahiro, Iori's antics are actually her way of trying to spark a romantic connection with him, believing the adage that 'the way to a man's heart is through his stomach.' Armed with a bag of marshmallows, Iori leads him on a chase every day, yearning for him to see beyond her facade. Will he eventually catch on to her sweet intentions, realizing that their relationship could be as delightful as a s'more?