Seiyaku no Frontline
Sai is a normal student - until one day suddenly a battle robot appears in front of him and tells him it is his mission to wipe out all humanity! If he did not succeed, the robot would pick another person to do the job. But Sai finds out that he can control the robot with his cell phone - and is determined to save humanity from its end!
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Front line of the oath has 30 chapters across 6 volumes.
As of now, Front line of the oath has finished.
Front line of the oath was published from November 17, 2015 to June 15, 2018.
Front line of the oath is a manga, originally from Japan.