Spy War - I Am the Organization's Arsenal

A visitor from later generations brought an intelligent arsenal and entered the world of espionage. On the first day he arrived, he changed the fate of an underground party member due to a strange combination of circumstances and started his espionage journey. After that, the Japanese and military commanders began to feel uncomfortable. Fujita Yoshimasa: Which country was this bullet made in? I can't see it at all! Xie Dongdong: Where did those underground parties get the grenades? Lao Dao: Fei Ying, you actually used an underground party gun to shoot me? Asano Hirobumi: So, who can tell me why I was bombarded while riding a train? And our protagonist is also in this world, turning rivers and seas upside down, showing off his magical powers