Sentimental Komuro Michael Sakamoto Dada-sensei (センチメンタル小室マイケル坂本ダダ先生) (or simply Masada, or Seccom Masada) is a character found in the Spaceship, playing a song on the large piano. If interacted with, he plays a portion of a song, then turns to Madotsuki to allow her to complete the empty portion, twice in a row.
He has a secret ending where you go to the roof on the last level after you have collected all the jellyfish and stand on the sign on the floor that looks like three circles, it will teleport you to the spacecraft. He will be playing the piano and when you go up and talk to him, he will play a part of the song you are playing and you must use the flute and continue the part of the song. After that, the door to the bed will open, you get into the bed and then you will get the secret ending.