Reincarnated Temporarily As A Ghost [Re:Ghost]

Awaken on mid-air. Raku, a middle aged salaryman involved in a tragic crash where his body was separated from body to limbs thrown inside a thick forest. Somehow a System called [The Administrator] appeared before him and proposed as he met every criteria to be reincarnated into another world, but he holds the offer as he left his USB at the office which contains porn files, CCTV footage and a photos of his crush, Luna.
Desperate for a second chance, he was temporarily granted to roam the world again as a wandering ghost with a mission to retrieve his USB before someone else use it and then die peacefully without regrets.
But luck was not on his side. Despite his attempt, Luna manage to browse the USB but she was so mad after found out the content that Raku kept was actually Luna biggest secret. The CCTV footage, that even Raku himself didn't know what it was. Luna crushed the USB along with the evidence and now she wanted him dead as she thought Raku knew all her secret and his sudden disappearance support her theory, but little did she know Raku was already dead and Raku himself are curious to find out what makes Luna so mad at him. He need to rediscover the CCTV footage and solve the mystery as a ghost.
Luna, hunting for a dead man and Raku the dead, had to solve the mystery before someone discover his dead body or the chance to be reincarnate will disappear.