@Kegnation
You can just read the manga after where the anime stops. But I suggest re-reading at least the chapters from the last episode, as they cut it off mid-chapter (ironically one of the gayest). Chapter 26-27.
Though I think if you like the anime, reading the chapters again to see some minor differences or to get into the flow of the 4koma style would be good anyway. These are really short chapters, so it wont take a lot of time. There are also extras that might not have been adapted (didnt watch the anime in a while).