Itai no wa Iya nanode Bougyoryoku ni Kyokufuri Shitai to Omoimasu.

Synopsis

At the behest of her friend Risa Shiramine, Kaede Honjō begins playing the virtual reality MMORPG NewWorld Online. Not wanting to get hurt, Kaede creates a shield-wielding avatar named Maple and puts all of her skill points towards defense. Although this leaves her with low speed and weak attack, her high defense allows her to earn new abilities and extra skill points for defense simply by letting enemies attack her. After meeting Kuromu the shielder and Iz the crafter, Maple decides to go to a dungeon to face against the powerful Poison Dragon. Using potions given to her by Kuromu, Maple manages to withstand the dragon's poisonous attacks long enough to develop a complete immunity to poison, allowing her to defeat the dragon by eating it. As a result, she not only gains the Poison Dragon's abilities, but also a one-of-a-kind set of equipment.

(Source: Wikipedia)