Miss Shino's Killer

[Orange] Wu Nong obtains the "Strongest Assassin Training System." The death penalty for failing a mission sets Wu Nong on the path of an assassin.

To get home, Wu Nong becomes a cold-blooded killing machine, relentlessly completing the missions issued by the System. At last, with the Federation's top brass laying a vast, inescapable trap, the hope of going home is mercilessly shattered by a helicopter's rockets.

Thinking he has already died, Wu Nong is helped by the System to possess a girl named Asada Shino. Desperate to return to a normal life, Wu Nong takes the alias Asada Shino and claims to be Shino's second personality.

To treat Shino's "fear of firearms," Miss Shino buys a device called the "NERvGear" and begins the closed beta of the fully immersive game Sword Art Online.

In short, this is probably, maybe, possibly a story about an assassin and Miss Shino being each other's love interests.