The series is about a man named Kusaka who has a fascination for marshmallows. Kusaka gets involved in a relationship with an office lady named Wakabayashi, and the story focuses on their relationship in the workplace.
AnimePiracy is a site to watch online anime like Ojisan to Marshmallow SUB online GoGoAnime, or you can even watch Ojisan to Marshmallow in HD quality just like KissAnime and 9Anime.