Often referred to as 'Mugi' by her friends, she is known as a wealthy girl with a gentle and sweet personality, who plays the keyboards in the Light Music Club.

Despite her wealth, she is fascinated by and finds joy in "normal" activities, such as ordering fast food, sharing french fries with her club mates, holding down part-time jobs and haggling over prices.
Since her father also owns a maid café, she often brings confectionery and an assortment of sweets and pastries to the club room, where she diligently makes tea with a tea set that is kept in their club room.

Tsumugi is considered a piano prodigy since she has been playing the piano since she was four and has experience in winning various piano contests.

Tsumugi displays a rebellious streak occasionally, diverting from her normally well-behaved and mature demeanor to the surprise of the others. She also displays a childlike eagerness from time to time.

Source:Wikipedia