I hope we'll get the continuation of theirs story like we got for previous couple. This didn't seem like the end. And since it's called Memento Mori aka Remember the death/mortality (remember that you'll die) we'll definitely have to see to whom sensei was married and how their death changed his life. Also sensei hid few smirks from our cute boy and at the end he said he's having fun again these days. I think he was grumpy and melancholic because he didn't forget the person he once loved but now since he met Daichi he started living again at some point, again related with the name, you should live because you'll die either way. I'm sure he noticed Daichi likes him and somehow that love will bring joy again in his life. Also I'm probably wrong, but for some reason I think sensei's dead partner was man
AS IF BY CHANCE! WHY DOES IT STOP ON THE MOST ADORABLE COUPLE?! OMG THEY'RE SO CUTE ESPECIALLY THE GUY WHO WORKED AT THE CAFE