こんにちは, Welcome to jENI NO PIKA PIKA NIHONGO.Today's expression is Natsukashii (懐かしい）When you meet someone after a long time, for example when you meet an old friend in school, you can use this expression,「ひさしぶり。懐かしいね」Or when you see an old picture, 「あ〜、懐かしいな」So please use this expression when you meet old Japanese friends, ひさしぶり、懐かしいね」Thank you and see you later.