MTL - Righteous Angry Hunting Demon - Chapter 375 terrible receiver

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

For unknown reasons, he finds himself transported to a parallel world's Japan, unexpectedly taking over the body of a soon-to-be high school student who had died accidentally. Surprisingly, he did not inherit any memories. However, the first challenge he faces upon arriving here is a language barrier...Just as he struggles to communicate with his new family, a heavenly voice arrives: the black technology system has been activated, and the initial item—translation konjac—has been distributed.This is the story of someone with above-average intelligence but almost no physical strength in the Classroom of the Supreme Power.

[System is assimilating Earth with the rest of the Vast Universe.]

[A Trial Program is needed for efficient assimilation and for that data needs to be recorded from 1111 individuals with Higher Potential Innate Abilities from the assimilating Planet.]

[This Trial Program was further divided into 3 Sub Programs namely, ALPHA Program, BETA Program and GAMMA Program.]

[Congratulations! You are one of the 11 Chosen individuals among 7.8 billion for the ALPHA Program.]

[As a Chosen member among 11 individuals of Alpha Program you will be one of the first to start the Trial Program.]

[When the Trial Program ends, the assimilation with Earth begins.]

[Survive, overcome danger and grow stronger. All the Best.]