4.184 out of 5 from 134 votes
Nana K. is a hopeless romantic who is co-dependent on everyone around her and falls in love at first sight with any and all men, even married ones; Nana O. is a wannabe rock star who has had to break up with the love of her life so that she can find her own path as a singer. As Nana K. boards a train to Tokyo, she longs to finally be with her beloved boyfriend Shouji; as Nana O. boards the same train to Tokyo, she plans to live her dream with only the guitar on her back. The two meet by chance both on the train and in the city - ultimately choosing to live together - and though they are opposites in every way the girls quickly become close friends. Together, Nana and Nana will learn the bittersweet truth about love, loss, and the growth that comes because of it.
Both manga's (and nana anime) are alike. there is a girl how fell in love with a guy , but then betrayed her. there is a nother guy who loves her but the stupid girl is still in love with her previous love. now its a rolller coaster of felling and events in the relationship of the love triangles. both girls in each anime ar both stupid.
Both Obaka-chan, Koigatariki and Oresama Teacher are shoujo manga with a delinquent female lead who changes schools in order to change her own image and maybe even find love. Do I really need to add the "if you liked one..." formula here? I think not.