 If you liked
Jibaku Shounen Hanako-kun
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 ...then you might like
Kimi ga Shinu made Ato 100-nichi
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It might not be obvious from the start, but in both we see a cute couple that's all fluff and fun despite rather morbid situations, themes of death and the weird surrounding world. And when the manga is serious, it offers you deep characters and complex emotions. All in all, the atmosphere, the genres and some themes are pretty much alike.