Shimazaki in the Land of Peace 5 (manga)

Former covert operative Shingo Shimazaki encounters a boy called Sata, who himself is undergoing combat training in an LEL branch organization—an arm of the same terrorist group Shimazaki has been hiding from since his return to Japan! Unaware of one another's circumstances, they nevertheless find themselves drawn to each other. But will their deepening connection invite salvation, or disaster…?!