TokiTowa

Time and Eternity (Toki to Eien ~Toki Towa~ (時と永遠〜トキトワ〜), sometimes called Toki to Towa) is an animated role-playing game for the PlayStation 3. A manga adaption by Kikou Aiba was serialized in Jump SQ.19.

Plot
Zack is a knight from the kingdom of Kamza, who is to be wed with Princess Toki. But their happiness turns into tragedy as a group of assassins appear on that day, and Zack is killed while protecting Toki. On the verge of death, Zack quickly learns two things: Toki has a second personality named Towa and can travel back in time. While Toki returns six months into the past, Zack's spirit travels along by inhabiting Toki's pet dragon, Drake. What ending will await the two as they try to prevent the upcoming tragedy?