Re:Monster Volume 1

Day 01-10
After being killed by a childhood friend turned yandere in his original futuristic, sci-fi world, the ESPer Tomokui Kanata was reincarnated in a different primitive, fantasy world as one of its weakest species, the goblin. Given a second chance at life, the newly reborn and renamed Goburou swears to make the most of it. Still in possession of his memories and intelligence of his previous life, as well as his original ESPer ability, [Absorption], Rou quickly matures.

Day 11-20
Thanks to his mature mind and ability, Rou has proven himself superior to the other goblins, and at their request he starts to train them. Showing rapid growth, Rou and his number 1 subordinate, Kichi, had quickly ranked up to Hobgoblins. Rou then decides to lead the goblins, growing quickly as he learns new abilities.