World: Any(But I suggest a very chaotic anime or Series.

Harem: Depends on you

Description: [Mc] was put in a very peculiar situation. Dropped off into [ series name here] in the worst situation possible he barely lasted a few seconds before dying. Thankfully he respawns at the start of the day he died. Welp he might as well make the most of it by grinding a countless amount of skills.

Powers: His ability Save point enables him to subconsciously create a Save point every day. Allowing for, in the case of his death, to load at that specific time and place. Not only that but he keeps the skills(obviously) he had earned from the day whether that be physical ( gain muscle mass or memory) or mystical( learning/gaining magic ) There is no limit on the amount of time he can do this.

Suggestion: MC shouldn't be your average guy or lazy otaku( if you do decide to do that then slowly make him a badass as time goes on), the man has died countless times and shouldn't be flustered or even care about girls, bit keep in mind that doesn't make him dense. He has too much shit going on for that. Instead make it so the girls have to actively convince him a relationship is worth it.

Suggestion two: There should be some mental backlash from his constant dying such a quirk(not the MHA kind) or a mental disorder made to protect his mentality.