DxD: Scion of Lucifuge - Chapter 12: A Sleepless Night!

Kirby Jon transmigrates to a parallel spacetime and is chosen to act as a bank robber in an exercise. Kirby Jon, who has obtained the God-level acting system, would receive a generous reward if he can act as a robber and attain an S-level score.

“Can a person suffering from amnesia have a total change in personality?”

The question lingers in Feng Ning’s mind.

Other people treat her coldly, claiming she is insidious, cunning and selfish. There were even rumors of her not being a virtuous wife and having illicit affairs with other men. However, she had no such memories.

After waking up from a heavy fall and knocked her head, she is now polite, treats people in good faith, and tries her best to get on her husband’s good side. No matter what she did, the past could not be undone and despite having no memories of it, Feng Ning calmly accepts her fate and slowly tries to mend things back. But why must fate be cruel to her? What did she do in the past to deserve this? In the first place, how did she end up in this sorry state?”

- Description from Novelupdates

High-school student Koremitsu Akagi finds himself attending the funeral of Hikaru Mikado, who had died in an accident during Golden Week. He’s not sure why he’s there, as he only exchanged a few words with Hikaru at school. However, Hikaru doesn’t seem to be completely gone from the world, as he comes back as a ghost in order to fulfill a promise to Aoi Saotome, his fiancée. Since Koremitsu is the only one who can see him, he asks him to carry out his promise in his place.

Complying with his request, Koremitsu tries to fulfill Hikaru’s promises to the rest of his “girlfriends”, helping them overcome past misunderstandings and repair broken relationships.

When he did not know her true identity, he treated her very badly, he disliked her too much, she was not elegant enough, she was in the way...Only later did he realize that the woman was his legal wife! He repented, tried to recover her feelings, but she was determined to divorce him.