What with the first page, did they live together? I mean, why would you start working/writing when your bf is in your place, especially if you didn't want your bf to see your work
MC likes Erica because she is his favorite character from the game.
And I don’t think he only has two years left, because he’s actually barely used that sword power. At this point in time, he’s only ever used it twice:
The first was when he saved a group of soldiers from a monster, and the...
That's just because of her obsession with explosion magic. She was determined to have the strongest magic and spent all her skill points to upgrade that magic.
In LN vol.5 / the Konosuba movie, she actually thought about learning other magic because of her lack of contribution during the fight...