MTL - Ranger King of Azeroth - Chapter 816 forever seventeen year old girl

Light and color, sound and scent;Clothing, food, shelter, transportation, smartphones, computers;Burning, freezing, friction, explosion, thunder, rain, growth, decay;All material changes and chemical phenomena;Our bodies, our thoughts, our world—were all built upon electromagnetic interactions!Whoever could control electromagnetic forces, they would be the tyrant who dominated the world!However, electromagnetism is too profound for us, so let us start by learning how to “Discharge”...

Pinning her tall body against the hard wall, he looked into her beautiful emerald green eyes as he spoke in a deep voice, "I have two options for you," his body came closer to hers as he continued, "Be my girlfriend. Or," his lips turned into a sly smile as he whispered close to her ear, "Be my boyfriend." He even dared to wink right before her as his dark orbs glinted amusingly.

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.

Power and desire, money and strength, conscience and responsibility, the road ahead is at a loss, as a time traveler, Simon, where will he go, this is a leading mainstream novel with a relaxed daily life and a slow pace

- Description from novelbuddy