Tensei Kendo no Harem Colosseum

The large breasted elf Duranta, a clumsy, peace-loving girl, somehow becomes the heroine of a bloody Colosseum; however, in truth, she was an idol-warrior, simply playing a part. Within the carnage of the Colosseum, the Thunder Troupe, led by Lighteus, put on performances that stop right before the kill in order to entertain the crowd. Unknowing of this fact, Princess Lunahasol, the clumsy and sadistic tournament sponsor, pretends to invite Duranta and her opponent Liguceun to her manor to dine