Shinka Tokusei de Saikyou Necromancer

Synopsis:

Makoto Kaneshiro, a former member of the Special Forces, had been spending his days engrossed in video games while struggling to find his place back into society. Suddenly, he receives an unexpected phone call. "Makoto Kaneshiro, is that you?" The caller possesses detailed knowledge of Makoto's personal information and gaming habits. Caught off guard, Makoto attempts to shut down his computer, but… to his dismay, he discovers the same situation repeating itself, again and again.