Worldwide Class Change: Got A Frost Fruit On My Fishing Pole On Day One - Chapter 78 - Parting Ways, Grandmaster?

Luan Bednicker, the youngest son of the “Great House.”But… I have no blessings?“The Failure of the Lord of Blood and Iron”“The Fool of Bednicker”I wandered seeking a place to die, away from the clan’s contempt.But then…“You? You’re my disciple, you little shit.”The greatest of all time.The one unparalleled among men.The perfect superhuman.I became the youngest disciple of Baek Nogwang?

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

You take up a student career.

Student career upgrade to lv.7

Acquired skills: primary school knowledge, junior high school knowledge, high school knowledge.

You take the college entrance examination,

You got a perfect score.

Your basic occupation has been upgraded to lv.9, and the job transfer system has been activated.

You change jobs to become a scientist, you gain R&D skills

You use research and development skills to get space fortress construction technology

You use R&D skills to gain starship technology.

You are invincible.

- Description from novelbuddy

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.