Skill De Isekai Musou Suru! Manga Raw: Drawing: Saikyou Mangaka Wa Oekaki

Since you specified manga raw (the original Japanese version), this review focuses on the art, panelling, and visual storytelling that might be lost in translation, as well as the core premise. Concept: A hyper-talented but socially awkward mangaka (manga artist) dies in a traffic accident while rushing a manuscript deadline. He is reincarnated by a goddess into a fantasy world. However, he has no combat skills, no magic, and his physical stats are abysmal. The Twist: His "Oekaki" (drawing/painting) skill is considered a useless artisan craft. He quickly discovers that anything he draws with intent and magical ink becomes real —but only if the drawing is perfect. A shaky line or wrong proportion makes the summoned item/monster malfunction.