This fountain pen is my favorite.

We go on a family trip once a year.

Sannen is my best friend, and he is a very interesting person.

Kou Sennen is my best friend.

I was able to know the truth of the hundredth year.

There is a Citrus nobilis tree in my garden.

We are in a marriage with an age gap, but our love is deep.

He started a business without a plan, forgetting the lesson of 'peach and chestnut seeds take three years to bear fruit, persimmons eight years.'

He succeeded in a difficult project with the spirit of 'ishi no ue ni mo sannen', which means great works are performed by perseverance.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.