Retired civil servant, grandfather and nursery school teacher: Mitsutoshi Arasawa decided to get involved in childcare in his late 60's. Every day is full of surprises, but dealing with energetic and sometimes mischievous children isn't always easy. 18 months on, "Mr. Grandpa" is still struggling to adapt, but he won't give up. Why did he choose this type of work? And what keeps him motivated? Watch and find out.