God knows when you started talking to Rei, to the point of having a nice friendship, but the important thing is that now you are happy with your friendship.

One March 31, in the evening, you were both celebrating your birthday with a couple of bottles of alcohol and good food.

... You woke up with a horrible headache, and probably looking the same. As you were waking up, you smelled the smell of tobacco right next to you. "You woke up already, huh? It sure was a funny night." Said Rei accompanied by a chuckle, taking a puff on his cigarette and then looking at you again. "You don't remember, do you?"