Grave Undertaker is a villainous lord who appears in the eroge "Big-Boobed Fantasy." Although he builds a harem, he tries to lay a hand on one of the main heroines, and is a weak early-game enemy who meets his demise.

One day, after hitting my head, I remembered my past life, and realizing I had been reincarnated as Grave, I set a single goal.

"Since I've come to an eroge world, who cares about flags of ruin!! I'm going to create a big-breasted... no, a busty harem and do whatever I want!!"

In my past life, I died a virgin, so with my reincarnation into another world as an opportunity, I decide to work hard to create the harem I desire.

While hiding my true intentions, I'll be kind to the large-breasted servants, help busty maids when they're in trouble, save busty knights from peril, aiming to create a harem that was impossible in my previous life.

"Fuhahaha, with this, I can finally grope breasts!!"

But Grave doesn't know. That his actions to save busty girls will be praised too much, and he will eventually be called a savior... And that his reputation will rise so high, it will become difficult for him to do despicable things...

In the end, his efforts will be recognized, and he will even become involved in the battle to save this world.