The story till now is done by season 1. The movie hasn't. Though there are similarities & content is same...there are few differences in how events takes place..i even feel there is a totally different feel to it..a lot of fun and laughing moments that i loved.a lot more depth into what goes between tanya and others...I would recommend reading the manga... I liked it better.. Even read it few times.
which chapter should i read if i already watched the anime