 If you liked Clannad: After Story |  ...then you might like Gintama° |
Sequels to fairly popular series which tend to be viewed as the "pinnacle" of the series or the season where the payoff kicks in at it's fullest. Although the prequels should be watched beforehand, they do nothing but justice for the entire series and one minute you could be laughing while the next minute you could be crying. Both also touch on themes of friendship and family through an arc based formula