The Lonely Snow Widow and the Cursed Ring

The ring had disappeared as if in hiding the moment Satoru tried to take it off. But then it reappeared and began to invade and fuse with Satoru's finger. Satoru loses consciousness and wakes up at the hospital where he'd been taken. Although emergency treatment saved his life, the doctor explains that the ring's curse was still draining his life force—and evidently, Satoru's reflection had vanished from the mirror. The cursed ring had finally bared its fangs. What can be done to counter it?