 If you liked
Natsu e no Tunnel, Sayonara no Deguchi
|
 ...then you might like
Kinou no Haru de, Kimi wo Matsu
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• Mysterious time travel elements that push the story forward
• Romance integrated with the story's drama elements
• Focus on a specific season as the background (summer for Tunnel to Summer, Spring for Yesterday in Spring)
• Written by the same author
Yesterday in Spring is a better novel than Tunnel to Summer by virtue of the author improving as he went, but they have many similarities.