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.

The story centers around Kusaka, an older man who loves marshmallows, and Wakabayashi, an OL (office lady) who loves Kusaka. The anime follows as their relationship unfolds at their office.
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(Source: Anime News Network)

An unaired episode bundled with the home release of Ojisan to Marshmallow.

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