The World as we know it has been torn apart shattered by a series of natural disasters that have turned civilization into a brutish nightmare of survival and has left whole cities buried beneath the Earth. It's now a lethal and chaotic place, a place where only the strongest and most savage remain alive. The strongest of them all is a giant warrior known as Violence Jack… Violence Jack tries to avert a civil war brewing among the wretched inhabitants of a subterranean metropolis called Evil Town. Based on a character created by manga horror specialist, Go Nagai. (Source: AniDB)

Hikaru has always believed herself to be just a normal high school girl...well, as normal as a teenager with a genius mad scientist for a father. She spends her time with her best friend, day dreaming about the boy she loves and watching her favoite super hero show. One day, the past that she has knows nothing about comes back to haunt her. She is shocked to learn that she is the last surviving member of royal line from a far away planet. Even more, she finds out that she has been protecting the ultimate armour and that it can decide the fate of the entire galaxy.

After gaining the title of the strongest warrior in the world, Peter Grill has finally proven his worth and is ready to take the hand of his beloved senior, the beautiful and innocent Luvelia Sanctos. Peter expects to have a healthy relationship with her, despite some objections from her father. Unfortunately, this dream quickly breaks apart as news of his grand victory spreads among the womenfolk of other races—ogres, orcs, elves, and others—some of them even vying for his seed to produce offspring blessed with his might. To avoid betraying the trust of his cherished Luvelia and causing a scandal, Peter strives to avoid other women's salacious advances. However, accomplishing such a feat with so many alluring women on his trail is easier said than done. [Written by MAL Rewrite]

Recap of the first seven episodes of Rifle Is Beautiful.