 If you liked
Nanatsu-iro★Drops
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 ...then you might like
Umi Monogatari: Anata ga Ite Kureta Koto
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While Umi Monogatari and Nanatsuiro Drops are both magical girl shows, they mainly focus on the relationships between the characters. There are a few action scenes in each anime, but what is most intense is the character drama. While they both have relaxed pacing and music, they become more dramatic as they progress (although Umi Monogatari is much darker).