Asami Futami is the older sister of one of the main characters, Shun Futami. She is an adult woman recognizable by her orange or ochre hair, which she typically wears in a ponytail, and matching orange or brown eyes. Her given name, Asami, combines characters meaning "hemp, flax" and "beautiful," while her family name, Futami, means "forked".

Asami is the owner and operator of the Mawarimichi Cafe. In this role, she treats her part-time employees with kindness and works to foster a welcoming and friendly atmosphere for her customers. The food she prepares, particularly the staff meal known as "makanai," is noted for its high quality and delicious taste.

Her primary role in the story is as a steadfast source of support for her younger brother, Shun. She offers dependable guidance and a listening ear when he experiences troubles, embodying the role of a deeply caring and reliable sister. She also provides him with a place to work and spend time at her cafe. Her perspective on her brother's often clumsy and "try-hard" nature is that she finds it endearing and cute, a view that contrasts with his own more self-critical feelings. Her cafe serves as a central meeting place for several characters; for example, she hires Hayate Ichikura to work there and later asks him to help Shun with his studying. Through these actions, she plays a key part in fostering the connections between the main characters.