Bokura ga Ita EP10 - Episode Ten

Without thinking Nanami steals an old picture of Motoharu together with Nana, from Yuri's knocked over bag and she's doesn't know what to do about it. But this doesn't matter, when by chance Motoharu finds the picture in Nanmi's notebook and decides to return it to Yuri. Since then there's been some friction between Nanami and Motoharu and one day she is invited to Takeuchi's birthday.