For centuries, a god named Celestin has been imprisoned on the moon for betraying the kingdom of Yggdrasil. Released by the fairy Morgan Le Fey, Celestin travels to Earth to reunite with his former pupil, the goddess Belldandy. Things go awry as Celestin erases Belldandy's memories of her boyfriend Keiichi and uses her as a catalyst to wreak havoc on Earth and Yggdrasil.

Legends tell of an invincible martial art known as Mutsu Enmei-Ryu, an unarmed style that allows the user to defeat any number of armed opponents using incredible speed and strength. This is the story of three generations of those who bear the name Mutsu, and their encounters and battles with the strongest fighters of their era.

A special unaired episode included in the 7th DVD/Blu-ray volume.

A year has passed since Okawari and the three sisters have grown up. Their likings and moods are almost the same. Haruka, the older sister, is a love-giving mother to the younger sisters and a discipline follower. Kana, the middle one, leaves everything to the last possible moment and always gives trouble to the trio. Chiaki, the little one, is the calculating and manipulating one; she likes to be admired and loved by Haruka and always gives trouble to the less blessed Kana. Despite being an unbalanced family, they love each other with all their heart. The family's daily life is as funny as ever; trouble and love are always present. Now it's time to see if they'll survive this age change since Haruka is now a young adult; she has even more responsibilities, having to watch over the young while integrating into the adult life. (Source: ANN)