Ii Ko Ii Ko Shite Ageru  

I will pet you on the head, my good boy, いい子いい子してあげる, I will pet you on the head, my good boy

Arashi dozes off while riding a train and later discovers that he has accidentally dripped saliva onto someone else. Despite not anticipating encountering this individual again, the elderly gentleman unexpectedly appears at Arashis educational institution.