Deokure Tamer no Sono Higurashi

LJO–aka Law of Justice Online–is the newest full-dive VRMMORPG to hit the market, and office worker Yuta—or Yuto, as he goes by in the game—is ready to spend his whole vacation immersing himself in the experience. His dream is to become the strongest Tamer, commanding the most powerful monsters, and he's even willing to shell out the cash to do so! But when he arrives in the world of LJO for the first time, Yuto is shocked to find that the special monster he planned to leave all the fighting to is...a monster dedicated to farming—without a shred of combat ability? Despite it all, Yuto quickly decides that his adventures in this world will involve way less fighting epic battles and way more harvesting plants, as he prepares to take the game at his own pace and with his adorable, trusty companion by his side!

(Source: J-Novel Club)