Please help me reason.

Your personal data is basically unavailable. ...

Personal reasoning

Case 1

Clue 1: The car keys are in Qiannai Nakamura's bag, and there is blood on the zipper of the bag, which proves that someone has moved it. Blood is unknown. It could be the victim's or someone else's.

Clue 2: the ice cream in the car melted, and when the car came out for a while, there was sea water next to it, indicating that it was a person crossing the sea.

Case 2

Judging from the discovery, either the murderer deliberately created the robbery scene and missed the gold watch; Either the victim was killed somewhere else, which is the second crime scene. The latter is more likely.

Found that No.2 understood that Ishii Ma might have been planted.

Sorry ... I found that I couldn't break it ... there was too little information ... I couldn't. ...