Ogasawara Uki manga
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...?!
Takahashi Miya is sick and needs regular check-ups. At university, he comes across Kanou Rei. Rumour has it that he is part of a dangerous club that distributes drugs and organises sex orgies. Is this true? And why does Rei seem to know Miya? (From Game Over Or Continue)
Gerun Fortress, under the command of stand-in officer Leonard de Limbourg, is attacked by the prestigious general Jemaru Jan of the Middle Eastern Empire. With no hope of winning, Leonard hopes to negotiate with Jemaru, offering his head in exchange for the safety of any survivors left in the fortress. But instead of killing him, Jemaru takes the beautiful knight as his prisoner and spoils of war. Forced to sleep with a man that is both his enemy and his weakness, Leonard's feelings of shame overtake his heart, but lust overtakes his body...