 If you liked
Hananoi-kun to Koi no Yamai
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 ...then you might like
Kaketa Tsuki to Doughnut
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While Kaketa Tsuki is Yuri romance and Hananoi-kun is a male-female romance, both have:
- The idea of working on individual goals/insecurities in order to be able to properly maintain relationships, romantic or not.
- Realistic character insecurities and personalities
- Have characters that can properly communicate their feelings with one another
Kaketa Tsuki is a little less spicy as Hananoi-kun, but still has really good payoff moments.
If you liked Ase to Sekken as well, you will like both of these, as all three of these works use the "work on oneself to better the relationship" mantra that produces very good stories.