Zazzleで四文字熟語漢字Tシャツシリーズを発売中。

獅子奮迅（shishi funjin / ししふんじん）
A lion’s fierce and furious advance. It also means to fight valiantly.

心誠意（sesin seii / せいしん せいい）
Do things with sincerity. Deal with the matter wholeheartedly.

人定勝天（jintei syōten / じんてい しょうてん）
If one makes an effort, one can overcome any difficulty.

一心不乱（isshin furan / いっしん ふらん）
The act of concentrating one’s mind on one thing without diverting attention to other things.