あと なの 修法 しゅほうでしょう
atona nokano goshuhōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 後七日の御修法

1. Probably on the seventh day after…; Likely a service will be held on the seventh day…

Polite
Presumptive
Conjecture