 If you liked
Steins;Gate
|
 ...then you might like
Plastic Memories
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They both have two protagonists, a male and a female, who get closer and closer in their relationship as time goes on and the more time that they hang out with each other. Both Okabe and Mizugaki face problems when they realise they are going to lose companions they have worked with and gotten to know after spending time with them. Steins;Gate goes into more detail of this problem with a slower pace and how the main character overcomes it.