 If you liked
Golden Days
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 ...then you might like
Kimi wo Watareba
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Similar time slip/time travel as a concept. While Golden Days has a slight BL as a subplot and the main male mc travel from present day to the past (Taisho Era), KWW is the opposite (the guy from Taisho era travel from the past to present day) with some yaoi scenes. Both have bittersweet ending though GD have more progression on the characters and relationship development.