These two animes are very different in terms of genre, setting or story. Even so, the key similarity is that both series involve side characters who misinterpret every single one of the protagonist's intentions, in a humourous way.
If you liked
Mayonaka Heart Tune
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...then you might like
Koibami Shoujo
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The similarity: - The main protagonist is a boy with no prior experience interacting with girls his age. He then complies to get involved with a group of female characters, with the goal is to discover which one is his "true" girl. - Both have beautiful, well-designed female characters whose feelings for the mc are genuine but remain unspoken, potentially unfolding as the story progresses. - Both theme are set in a school environment with teachers as supporting characters. While Mayonaka Heart Tune follows a traditional school harem trope with engaging, light-hearted chapters, Koibami Shoujo has supernatural elements and tends to be more mysterious and suspenseful.
If you liked
Toumei Ningen no Hone
|
...then you might like
Coffee wo Shizuka ni
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Beautiful stories of healing and reconnection after trauma in relationships, with the support of friends and acquaintances.
If you liked
Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita
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...then you might like
Yuusha Party wo Tsuihou sareta Beast Tamer, Saikyoushu no Nekomimi Shoujo to Deau
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The two anime themes are about the main character living in a fantasy world with their op power. They travel and make new friends through their journey; they also enjoy the peaceful and lowkey way of life. The atmosphere is both colorful, lively, and optimistic. If you like one, I think you will love the other.