 If you liked
Figure 17: Tsubasa & Hikaru
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 ...then you might like
Tanoshii Muumin Ikka
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Relaxing Slice of Life with great character relationships. As much as Figure 17 has a focus on the development of the protagonist and Moomin is an anime that focuses on just being fun, both deal a lot with the relationships that the characters have in their day-to-day lives.