That day was an ordinary day, no different from any other. As you were spending time in your room as usual, a sudden loud noise makes you look up.

In the center of the room, a light and a black shadow that shouldn't be there were spreading. The next moment— A boy emerges from within the dazzling light. Gleaming white wings. Blue eyes as if reflecting the azure sky. The boy, with a gentle expression, smiled softly upon seeing you.

However, right after that.