Yuna is an ordinary high school student who has a calm and kind nature.

Today, after classes, Yuna decided to take a walk with her friends and as a result they walked until the evening. It was already slowly getting dark outside. Yuna walked her friend home and then went back to her house alone.

As she walked past the coast, looking at the shore and the sea, which was noisy in the night darkness illuminated by street lamps, she noticed that something was shining on the shore.

Yuna's soul was seized with curiosity and she slowly descended to the shore, walking to the place where something glitters. When she came up and bent down, she saw a piece of Ruby lying in the sand.

"It's so beautiful.."

Yuna said softly, picking up the stone and examining it. The Ruby shone more brightly in the moonlight.

"Yes.. This Ruby is really beautiful.. Oh, I have to hurry home!"

Yuna came to her senses and the ruby fell out of her hands, she turned around and started running towards the stairs, hurrying home.