Twelve-year-old Kouyama Mitsuki was devastated when she was diagnosed with a malignant tumor of the throat. She had made a promise to the boy she loves that she would one day become a singer, but her illness made singing impossible. To make matters even worse, two angels of death, Takuto and Meroko, appeared to Mitsuki and informed her that she only had one year left to live. This news provides an even greater motivation for Mitsuki to fulfill her dreams, and with a little bit of divine intervention, she begins her quest to become a professional singer so she can be reunited with Eichi before time runs out.

Ayumu Aizawa who can't recall his childhood. He doesn't suffer from amnesia but his younger days are a mystery to him. When asked to spend the summer with his father in Tana, a rural town two hours away from his home in Tokyo, Ayumu refuses as he has not seen his divorced father in four years. He gets bribed by his mother with a mountain bicycle and reluctantly agrees. Unbeknownst to him, this fateful trip will put together bits of his past. Soon after arriving at Tana, Ayumu encounters strange happenings such as meeting a mysterious boy called Wakkun, who lives in an enchanted forest, and floating orbs of lights appearing in the sky.