Jikuu Tokusou Athena-san

The year is 2300. Terrorists, using a time machine for evil purposes, have come back to 2008 to change history! Athena, a member of the Space-Time Investigations Bureau, Special Investigations Group, fights the enemy wearing a battlesuit that she controls with psychic abilities, but when she runs into trouble, she becomes bait for a sexual beast and his tentacles, and ends up gangraped by the terrorist men!