 If you liked
Watashitachi no Shiawase na Jikan
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 ...then you might like
Haru no Noroi
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I feel that Haru no Noroi and Watashitachi no Shiawase na Jikan both ride on the themes of tragedy, regret and (of course) romance. Both tell a sad tale of people seeking a purpose/a reason to live on. I absolutely love these works and I definitely cried (a lot) to both, Lol.