Hatsukoi o Oshiete Moratta

Mai dreams of becoming a fluent English-speaker and teacher, because her first crush was an American boy. In the astronomy club her friends make her join, there's a boy named Saburo, who says he'll teach her. He looks cool and a little distant..But after the welcome party, Mai wakes up next to him.. in his bed!! "You were so cute yesterday night", he says, with a satisfied smile on his face.. "Wait, did we have sex!?".