Source manga is: Tensei Shitara Dragon no Tamago Datta - Saikyou Igai Mezasa Nee -- in english it's: Reincarnated as a Dragon’s Egg ～Lets Aim to Be the Strongest～

Found out about the exsitance of this from youtube of all places and decided to colour this to see if it garners any interest.
Of all the "We use game mechanics" Isekei-likes out there now, at least this one has the decency to have the main character STAY a dragon throughout the story rather than Issue 1 and having a human form take over for the rest of the story - having had a peak at the light novel, Irushia goes through A LOT of shit due to being a dragon, isn't always just handed stuff immediately to negate any tension in the story, and gets beat to shit in most of his fights, so the story is at least decent