Although Kippei and Keita have been together for ten years now, they're still finding it difficult to be completely honest with one another. However, it seems fate has a plan to reignite their passion and fix their communication problems. The morning after Kippei accidentally breaks a sentimental mug, he swaps places with his younger self from ten years ago! Suddenly, the couple both have the opportunity to face the person they fell in love with a whole decade back, and maybe reignite the passion that's been threatening to fade away.