Kei Kusanagi (草薙 桂, Kusanagi Kei) is the main protagonist and narrator of Please Teacher!.


  • Hair Color: Light Brown
  • Eye Color: Light Brown
  • Status: Student


Kei is a young boy who has tan skin, cut light brown hair and light brown colored eyes, he's usually always seen wearing glasses.


Kei is a shy but smart and kind-hearted young boy who cares a lot for his family and is very protective of Mizuho.


Kei is an 18 year old who looks like a 15 year old after a three yearlong "standstill" which is a coma-like state that occurs during a time of extreme emotional distress. Standstills are derived from an unknown - possibly psychological - disease that Kei and his friend, Ichigo Morino, have. He tends to be a very frail and shy boy, not often wanting to assert himself when need be. After observing the landing of a UFO while on the bank of the nearby lake and subsequently observing the alien on the lake shore, odd things begin happening to Kei in connection with this alien. The next day, Kei is surprised to find, like everyone else, that one of their teachers quit and a quick replacement was found which just happened to turn out to be Mizuho Kazami. After a few more encounters with each other, Kei is taken to her spaceship where the whole situation goes from bad to worse. Upon striking Marie, a tiny and computer-like helper of Mizuho's, it effectively is unable to perform as well as it seemed to work, which often puts the characters in strange situations if they can't rely on the help of Marie. Eventually, after Kei and Mizuho are found in a locked storage room by Kei's uncle and the principal of the school, his uncle impulsively tells the principal that Kei and Mizuho are in fact married. Later, Kei and Mizuho do actually get married, though only the paperwork is done while there was no official ceremony. This whole situation is, of course, kept secret from Kei's friends as Ichigo Morino constantly tries to pair Kei up with a friend of hers, Koishi, and all the while Kei and Mizuho's relationship and affection for each other only grows.


  • As of now, it remains unknown as to what happen to Kei's parents as nether Kei, Minour and/or Konoha had never explained on what has happen to them.
    • Adding in to that, its never really explained as to who is the mother and father's brother and sister.
  • Kei Kusanagi is very similar to Hajime Murata, a character from an anime show, Shingu: Secrete of the Stellar Wars, seeing as they are both are young teenage boys, both wear glasses and both are the main protagonist of their respective shows, also both characters have a sister (Kei: Kozue, Hajime: Futaba).
    • Coincidentally, both Kei and Hajime also serve as the narrators of their respective series.
      • Whats interesting to note is that Mizuho's outfit (as in the outfit warn in episodes 1, 6, 10 and 12) is very similar to Kyoko, another character from Shingu: Secrete of the Stellar Wars who is also the mother of Hajime.
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