according to the end card for the first comic, it was because an canadian fan sent him a text saying "I sushi your manga" and he just road with it.
Thank you, random Canadian fan!
Hugging's like that, right?Keisuke, are you okay?But then even for Westerners,...Come on!What do you mean, pretty normal?!It's pretty normal to do that though.That sort of thing's usually left until you get home and...What's pretty normal!?Like...
Like thi-......it's not like you just hug in public, right?Squeeze