Don't wanna spoil but...
There's a girl in the slums who asks you to find has ball... twice.
The cream scone stuff isn't really a quest. It's just a place you can visit and buy a healing item (which you can give Mao in chapter 2). It's also a silly reference to a manga I drew a few years ago xD
And the chest is just there behind the Guild's counter. Menacingly.