Great Disaster of Sagami Bay Arc

The Great Disaster of Sagami Bay Arc (相模湾の大災害編) is the first major story arc introduced in the Valkyries and Blade Dancers series. The arc introduces the three main protagonists, Suzuran Arisugawa, Maihime Tendou, and Kazuyuki Yanagi, as well as seven heroines (Suzuran is one of them), Sayuki Asahina, Noa Hiiragi, Manaka Ichinose, Honami Mitsumine, Alice Sakayanagi, and Yume Tsubakuro.

The arc itself focuses on Noa Hiiragi's mission to defeat Nanae Origami in order to uncover the truth behind the Great Catastrophe of Tokyo Bay that occurred fifteen years prior to the main story as well as the circumstances of the other characters who find themselves inexplicably involved in Noa's actions and how this series of events shake the islands of Japan down to its very core.