Hi hon! Take a look at the comment below and the answer to it. :D
In short, the differences between ending 1 and 2 are minimal in-game, given that the VN ends shortly after, so you didn't really miss much. If you'd still like to get it, though, take a look at which 'fraction' your MC decided to work with. The placement of the choice depends on the route, so they might pop up and different times.
Let me know if you need more help!