Reinforce Zwei (リインフォースⅡ(ツヴァイ) Ri'infōsu Tsuvai, also spelled Reinforce II) is a is a::Unison Device created by master::Hayate Yagami to succeed creator::Reinforce (Eins), whose memories and personality she now carries. Rein, as she is commonly referred to, is a member of the Yagami family and works for the member of::Time-Space Administration Bureau under Hayate's command. On her first appearance in the A's epilogue she is summoned as a hologram from the Schwertkreuz, though in StrikerS manga and StrikerS she has a solid form. Although Reinforce Zwei is significantly smaller than her namesake and all other members of the cast, barring Agito, she is capable of becoming the size of a normal young child, although since this form uses a lot of power it is not practical for use in combat.