Yui is trapped in the abandoned supply base, and the BETA have broken through the defense lines.  With no hope of escape, she attempts to destroy the prototype cannon to keep it from falling into the wrong hands...
There isn't much we know about the BETA.
¡El conocimiento que tenemos acerca 
de BETA no es muy amplio que digamos!
¡El conocimiento que tenemos acerca 
de BETA no es muy amplio que digamos!
Não sabemos muito sobre os BETA.