Perhaps, this gentleman is biting a door handle. Or perhaps, he is eating a door handle made of chocolate.
The Tetsuwan Dash is a long running Japanese series that features boy band (and former ) Tokio. On the show, the group tries to pull off a variety of feats, like building a foam house or seeing who can last longest on the least amount of money—stuff like that.
In Japan, schoolgirls are often the default characters for product pitchmen. They pop up in sports drink ads, life insurance ads, bicycle ads — you name it.