He is showing behavior characterized by 'chuunibyou'.

His music conveys a sense of youth and tenderness, healing the heart.

His young and tender heart was very sensitive to new experiences.

This project is still in its infancy.

Her poetry has a unique elegance.

I cannot forget that specific date.

Your actions are a clear case of copyright infringement.

Today is the death anniversary of my grandfather.

I deeply apologized to him.

He made a deep apology.