If Caster's spread such a wide net, she must have observed last night's battle.

He could've found out Sonohara Anri's address by just taking a look at the class list.

If she catches me spying on her, she'll hate me!

<mothertongue l="creo" m="pa f???? bri." b="Only if you can do it and be " a=""/>

Much safer than an ordinary letter, which anyone can intercept en route to its recipient.