Mifuyu is a pure girl who grew up in a country side. After her mother dies, she loses her place because her father welcomes his lover to their house. Therefore, Mifuyu starts to stay at Naoko Kashimada, who is a cousin of the late mother. The Kashimada family is blessed with "the wealth" that Mifuyu can’t get even though how strong she desires. “The world is unfair.” She begins to find her place in Kashimada family, and it is the beginning of her life as a “Nepenthes woman”.

Mifuyu gradually begins to find her place at her new home. However, this is under the condition that she goes to a vocational school. The sudden changes in her life style makes her realize that she had been living life which was quite different from others her own age. How will she try to fit in with her new luxurious life style!?

Mifuyu is in a dilemma, after she finds a receipt for a pregnancy check. Meanwhile, even though she has been offered the chance to take care of the house, it still means nothing to her unless the family accepts her properly. How will Mifuyu be able to come to terms with everything that is going on around her!?

Mifuyu’s father’s new wife Haruka suddenly turns up at Kashimada’s family home. Why is someone who purposely pushed her out of her own house here? Meanwhile, Haruka tries to get more accustomed with the family, but what is she doing all of this for?

Yutaro's cruel words have finally ended Mifuyu's stay at his family home. After she is forced out of the house, she looks back at all the luxury which she has now lost. But, is this really the end of the road for her!?

After returning to Tokyo, Mifuyu wants to make sure that she doesn’t ruin her opportunity this time round, by trying to figure out how she could return to the Kashimada family home. Meanwhile, Hitomi decides to play dirty by making a move against Naoko with some secret pictures of Mio with her lover!

Mifuyu tries all she can to find the best way of staying at the Kashimada family home. Meanwhile, when Yutaro, the boss of the family is ordered by his company to move to Kyushu Prefecture, Mifuyu’s position becomes vulnerable as she tries to figure out her next move.

Mifuyu decides that the Kashimada family home is where she wants to stay. One of the reason being, is her new relationship with Ryuhei. Since coming to the house, he's the only member of the family who had been nice to her. This begins to dig a deeper hole for more trouble in the family home as the series reaches its final climax.