 If you liked
Steins;Gate
|
 ...then you might like
Utsuro no Hako to Zero no Maria
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The first volume of HakoMari, is nearly identical to Steins;Gate. They both are highly psychological and focus on a protagonist stuck in a time loop, ending with an unfortunate event.
HakoMari differs with focus on supernatural elements, while Steins;Gate focuses on scientific elements.