 If you liked
Gokujou Seitokai
|
 ...then you might like
Mahoraba: Heartful Days
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Very character-based series. Both Mahoraba and Gokujou Seitokai uses the main character and a loose storyline to take the viewer through the lives of the side characters in great depth.
Similar type of no-frills, simple artwork and animation, both are fairly light-hearted (for the most part) series.