 If you liked
Hakata Tonkotsu Ramens
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 ...then you might like
Koroshi Ai
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While the plots of the two stories are different, both animes feature two assassin protagonists, one of whom was originally perceived as the main enemy of the other main character, and the other seeking in their murderous acts a way to heal a wound from the past.
Furthermore, the two protagonists see in the two animes their relationship evolve through the events in a very similar and interesting way, going from complete strangers with a one-sided attachment to mutual affection.