The light and shadow of the Mamiya family... Akari and Hikari's "One Pact" -- The conclusion!! The rule for duels between the Mamiya siblings -- "One Pact". This means that "the loser must grant one wish of the winner". Mamiya Hikari proposes a "One Pact" to Akari in order to fulfill a certain wish. The battle between the two, who have walked separate paths as the main family and the branch family, light and darkness, intensifies as their secret techniques clash fiercely against each other.