Tamashizume - Manga

From Aerandria Scans: When she merges her soul with that man, she will become the Goddess of War! Itsukushima Hinata is a cool high school girl who lives a normal life, but one day, all of a sudden, her life became not so normal anymore. The strange man that suddenly appeared insulted her best friend and enraged her. He's a mysterious man who has a costume like that of someone who just woke up from a sleep from the ancient times. While Hinata is still confused, that man hugs her out of the blue! And then, she transforms...?!