Tsubaki is in the midst of the happiness of her life when she gets married to her childhood friend. However, something suspicious suddenly appeared at the wedding... and when she woke up, she was a baby!　 It seems that she has been reborn in another world as Millie, the youngest daughter of a duke, with memories of her previous life. She recalls the cause of Tsubaki's death, but has no idea what it was. She is determined to enjoy her new life to the fullest, but to her surprise, she has six unique and beautiful older brothers...!　Millie is doted upon by her gorgeous family and her days seem to be peaceful, but an unexpectedly hard fate awaits her...?　 A heartwarming and sometimes suspenseful (?!) fantasy of a beloved young girl.

Agnes, a noblewoman was ridiculed in the social circles for being unfashionable, happened to help Nazelbert, the duke's son, who had been betrothed to the Princess. However, the Princess saw this and ordered Nazelbert to marry Agnes instead as punishment. Isn't it terrible to marry that girl as a punishment? Look, he seems to hate it too. Wait, he doesn't? This is a story about an unfashionable lady and a duke's son, who grow closer to each other.