Rebirth Harem in the Apocalypse

The world turned upside down. Yet a group of weird circles enjoyed as the world changes. A group of friends live their lives to the fullest in the changing world. In this group of friends, A man with a screw loose on his head loves to watch his girlfriends being screwed by his friend and other guys. But he is not the protagonist. A man with dangerous feeling, ravage the horde of monsters with a manic expression. Loves to tear those flesh apart. Eating their meat raw. Crazy eyes and fang. But he is not the protagonist. A man with advanced intelligence, the one who supervised the group with his cunning plans and amazing inventions. He is not the one either. A man with Gynophobia who shivers at the sight of girls but looks cute like hamsters that every shotacon loves. He is not the protagonist either. A man with normal looks, average in every characteristic. A man who is the most sane in the group, A man who has a 'normal' girlfriend is not the protagonist either. The protagonist is a man who loves repetitive stuff. He likes doing boring and pointless stuff that no one wants. Even failed to advance in his second year of college for the 8th time. He never gave up.