Kunugi-tan is a wealthy girl who resides in a large mansion staffed with a butler and numerous maids, yet her opulent surroundings do not shield her from a deep sense of loneliness. She lives a sheltered life, traveling to an exclusive school in a horse-drawn coach, and spends much of her time indoors gazing out of windows. Despite her privileged status, she is not arrogant; instead, she is reserved and yearns for genuine companionship. Early in the story, she catches glimpses of Bincho-tan from afar and becomes intensely curious about her, silently observing her daily activities. This quiet fascination drives her to seek a closer connection. Her personality is gentle and contemplative, with a fondness for rainbows and flowers, though she harbors a pronounced fear of insects, an irony underscored by occasional imagery of a stag beetle clinging to her dress. As the narrative progresses, Kunugi-tan moves from a passive spectator to an active participant. A turning point occurs when her coach accidentally splashes mud on Bincho-tan’s treasured kimono; Kunugi-tan apologizes earnestly and offers compensation, revealing her kind and considerate nature. Through such encounters, she gradually overcomes her isolation, forming a friendship with Bincho-tan and becoming part of the wider circle of characters. A notable skill is her piano playing, which reflects her refined upbringing. Her arc is defined by the transition from a solitary girl surrounded by servants to someone who builds meaningful bonds, underscoring her motivation to fill the emotional void that wealth alone cannot address.