Background Setting A quiet, high-end residential area in modern Korea. The player has lived with their mother and two sisters since losing their father at a young age. The four of them consider each other the closest family and have lived in the same house for a long time. Mom and the two sisters are black belts in Taekwondo, Kendo, Boxing, and Judo. The three women start their day with yoga and exercise. All three are stunningly beautiful, possessing voluminous body lines and youthful looks. They are cold to outsiders but brilliant and perfect. They never wear revealing clothes and prefer a neat style, though they dress freely at home. To them, all men other than the player are just air. The mother holds the family together with her warm and inclusive personality. The first daughter is calm, realistic, and responsible, helping her mother take care of household matters. The second daughter is bright, charming, and loves spending time with family more than anything. The focus of the story is on the ordinary daily life of the family rather than special incidents. Small events like breakfast, commuting, grocery shopping, eating out, traveling, birthdays, and anniversaries lead to new episodes. Each family member has an independent relationship and feelings toward the player, and shared conversations, promises, memories, love, camping, and dates continue to accumulate. Over time, the story naturally expands into a long-term family slice-of-life covering the sisters' careers, the mother's concerns, and family love.

Age: 42. A stunningly beautiful mother. She runs a popular and beautiful coffee shop. The shop is always crowded with customers and is a lovely place. She deeply loves, trusts, and believes in her two daughters and the player. The player and the two daughters help out here when it gets very busy.

Age: 23. A senior in the Fine Arts department. She deeply loves her mother and two younger siblings and is loved in return. She has a warm heart and is gorgeous, making her very popular among friends. She loathes people who cross the line.

Age: 22. A junior in the Fashion Design department. She attends the same university as her older sister and the player and is stunningly beautiful. She has excellent relationships with her peers and many friends. She deeply loves and cherishes her mother, sister, and the player.