A middle-aged former salaryman, now unemployed, with a collection of odd mannerisms and a mysterious past. From the moment he first takes advantage of Tsukasa's hospitality the two engage in the sort of sparring that marks either sworn enemies or fast friends. Formation of the family project is his idea, and when it finally comes together he takes the helm in the father role.

Swindled by a con man who takes advantage of her and leaves her bankrupt, she is about to jump off a bridge and end her life when Tsukasa saves her from falling. Despite her glamorous looks she is bipolar and insecure, and she latches on to Tsukasa as her source of stability in an uncertain world. She takes the mother's role in the Takayashiki family.

The daughter of a wealthy family, in rebellion against her parents she flees to one of their unoccupied houses - the Takayashiki residence where Tsukasa has taken shelter. While she aims to make a living as a portrait artist in a nearby park, her utter lack of ability and penchant for drawing people "as she sees them" leave her effectively unemployed. She is the cool, haughty picture of a refined heiress, but her prickly exterior hides a profound emotional insecurity. She reluctantly accepts the role of eldest daughter in the family project.

An introverted girl with money always on her mind, she currently makes a living doing odd jobs around town. She is extremely withdrawn and difficult to engage in conversation, though she was friends with Tsukasa in their college days until she suddenly disappeared from his class. Due to food-related trauma the only things she eats are block-type nutritional supplements. When the family project is formed she takes the role of second daughter.

An innocent, purehearted girl who smuggled herself into Japan in search of her estranged mother. After a string of misadventures she was found and taken in by Tsukasa, where the game's story begins; blissful ignorance of her precarious situation is both a strength and weakness of her character. Her skills as a masseuse are legendary, and when the family project launches she willingly takes the role of the third Takayashiki daughter.

A girl who ran away from home and has been living in a cardboard shelter in a public park. After a storm destroys her home she finds refuge in the Takayashiki house, where she meets Tsukasa and the others. Despite her bad luck she's kept an honest and refreshingly unaffected personality, with a few notable quirks - she's a devoted boys' love fan, and when put on the topic she is quite enthusiastic about S&M yaoi. When the family project is proposed she is one of its staunchest advocates, and happily adopts the role of youngest child.