The boy who Hayate meets is revealed to be Wataru Tachibana, Nagi's fiancé. However, Nagi and Wataru can't stand each other.
Yes, like the Oedo Line 
or the Marunouchi Line.
Sí. Como la línea Oedo o la Marunouchi.
Sim, tipo a Linha Ooedo 
ou a Linha Marunouchi.