This is looking good, it says harem, so I'm guessing the first three are these girls (hope that tsundere falls for him quick, I don't want to see her be a bitch to him anymore), and will there be more than those three?
The only major concern I have about this, is the MC seems to ahve an idiot personalty and the whole girls never saw me is just dumb and lame, cringe worthy if you wish. It would of been better to go with a guy who was always rejected due to bad luck. Thats more fucking believable and less cringy. I sorta like the idea that hes sorta a cripple (weak legs) but was raelly hoping he'd make the girls stronger and be their clutch. Rather than a boring cliche powerup for himself which always happens :/
Also what happened to the girl he drowned with ? would it mean she was some god who didnt know how to swim ?