Possibly this depicts a secret fantasy of many healthy young Japanese males - the female childhood friend who's a foreigner, exchange student and (perhaps most important) has no qualms in initiating happy sexy fun time.
Opinions may vary as to whether he downplays their relationship so as not to draw un-necessary attention to himself or her, or whether it's simply a matter of keeping her to himself. Either way, I suppose we could say to MC: "You Lucky Bastard (GRR)!"
Ending leaves open the possibility for a sequel ... well, that's up to Midorino-sensei to decide on.
Considering that ending, if there is a sequel, I can't imagine it going any other way than him choosing the college she attends as a foreign exchange, or simply moves to the states to be with her. This is going in my faves.
MC-kun definitely is gonna decide on a school in the States, if his answer to her "Just don't cheat on me," was a sincere and immediate "Of course not." Only logical answer.
Opinions may vary as to whether he downplays their relationship so as not to draw un-necessary attention to himself or her, or whether it's simply a matter of keeping her to himself. Either way, I suppose we could say to MC: "You Lucky Bastard (GRR)!"
Ending leaves open the possibility for a sequel ... well, that's up to Midorino-sensei to decide on.