第10話: マリーとシオンの悲しい過去が、マリーとセト、コノハの出会いへと繋がる
A past event is shown where the Medusa Azami is attacked by residents of a nearby village, who consider her a monster and thus a threat, but she fights back using her powers in order to protect her daughter, Shion. After learning from the remaining survivor that her husband, Tsukihiko, was beaten up while trying to defend her, Azami makes the painful decision to leave her family behind in order to protect them from any further harm. As time went by, Shion eventually gave birth to Marry and raised her by herself, making sure she would not leave her home. One day, when Marry steps outside, she is caught by a pair of humans who try to kidnap and make money out of her, and although Shion uses her powers to stop one of the men, she is weakened as a result. They are both killed with a blunt wooden object by the second man. As both, Marry and Shion, are dragged into the Heat Haze, ruled over by the Snake of Clearing Eyes, as a result of dying on August 15. Azami uses the last of her strength to pass on her role as queen to Marry, allowing her to return to the real world. Some time later, Seto hears Marry's internal cries with his own power and comes across her, deciding to become friends with her. Back in the present, Marry comes across Konoha on the street and takes him back to the hideout, deciding to become friends with him and take him to where the others are. (Source: Kagerou Project Wikia)