Casarin was born in 1982 in Tokyo. She began drawing pictures at twelve and finished a 2-year program at an art college. After working in an office for about fifteen years, she made a career shift into a painter, having gone through mental illness. She is currently creating her work as a freelance painter.

“I have spent half of my life amid anger. Rage in me eventually becomes a passion for painting and thus my drive,” says she.

Anger is enigmatic emotion to her that grows bigger according to how strong its tie is with the risk of lives and its target. As it gets developed, it becomes a mixture of a range of emotions: sorrow, emptiness, hatred, and amusement. When it comes to the anger she feels toward what she treasures, emotion with indescribable complexity surrounds her.

She saturates the colors she uses in her paintings with what she experienced and felt in her daily life. Multiple layers of colors may represent herself as an ambiguous and immature being.

She dreams of offering help to kids dealing with trauma, which she wishes to realize once she becomes able to support herself with painting work.