Prologue
Professor Agasa wasn't home. He went to a Midnight Mass in Osaka to accompany Heiji, Ran, Sonoko, Kazuha and Saguru. Every year, all of them would always go together to a midnight mass 12 days before Christmas, including Kudo, of course.
They believe that it is a good practice to attend midnight masses before Christmas even though they are not full fledged Catholics. Saguru rushes to go home to Japan from London, England every year so that he could catch up with his friends in going to those masses. They are naturally religious people actually, believe it or not.
In fact, little do they know that Akako, Kaito, Aoko and Aoko's friend are also going to the same church that they go to every year for the same purpose to honor the birth of the child Jesus.
However, this year was different; Conan couldn't go with them because it would be inappropriate for a child to go out that late at night even though he really wanted to go.
And so, he just had a sleepover in Agasa's house so that he can accompany Haibara since she was going to be all alone and he didn't want to stay home with that drunkard, Mouri Kogorou because he said that he would be too weary to be with him all alone without Ran. He would just scatter beer and cigarette butts all around the place.
"What a scatterbrain that person is! I can't stand him! I might even end up cleaning his garbage just like what Ran does! No way am I going to do that!! I am better off staying in Haibara's place for the night."
Shinichi pondered.
And so, that is how Shinichi ended up all alone with Shiho in Agasa's house.