 If you liked
Change the World: Kyou kara Satsujinki
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 ...then you might like
Mizutamari ni Ukabu Shima
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Very similar premises, with an event that causes the two main characters to bodyswap. Both manga have a main character with similar "professions" and a bleak view on life, and both touch on how that view can start to change. Change the World feels more complete, but both have interesting takes on what happens when you find yourself stuck in another person's body and life, especially when said life may be less than desirable.