I can't really remember any information but I know that he did it in a place with a giant clock or something similar. I saw it once and forgot to take a screenshot so right now I'm searching but my efforts are in vain.
I believe this is Tou no Kanri o Shite Miyou or Let's manage the tower
In Chapter 34 of the manga, the main character summons 3 goddesses to bless a temple. One of the three says that he is the first man to ever summon a god. The temple has a circular hole in the front wall that the goddess are summoned in front of, which could be mistaken for a clock tower.