Battle Angel Alita: Mars Chronicle 10

The operation to track down Yoko is interrupted when Gyapollo launches an ambush in the night. A clever trap does some damage, but Keun knows a duel is inevitable, and that he must put everything on the line. Meanwhile, Yoko's solo adventuring leads her to a monumental discovery—if only she understood its significance…

Volume 10 of the Battle Angel Alita: Mars Chronicle manga series by Yukito Kishiro.