IF the 1/1 is highest level mean he got highest growth rate, then if he train hard he'll be super strong in no time. But if he's stay weak forever then the only way would be items which very stupid. I'll read for a while to see what's gonna happen then.
In defense of author about magic. I don't think common people will be so conscious about magic even if they've got one in one day, unless they're deeply desired for power.
I'm not very well handle the bully. I would kill them all if I'm the MC, back in my day I nearly send people to hospital but they're quick to surrender so I couldn't go further.
This is what should be in many manga. They emphasize about sexual desire too much but never even touch a chick in those mangas. It is nice to see that MC not really emphasize about sexual desire and just go straight for it, feels more real this way.