He sang a dirge in his heart.

He was tired, and as a result, it even affected his work.

He expressed his emotions by playing the piano.

Many dolls are displayed at the Hina Matsuri festival.

He dreamed of becoming a pilot since he was a child.

The dirigible was quietly flying in the sky.

That movie left a deep impact on him.

Kokoro is my best friend.

His heart was very kind.

In Chinese astronomy, there is a constellation called Heart.