Kei Kusanagi

Japanese Name 草薙 桂
Romaji Name Kusanagi Kei
Nicknames N/A
Series Onegai☆Teacher
Age 18
Weight N/A
Height 155 cm
Date of Birth N/A
Blood Type N/A


Kei Kusanagi: The protagonist of “Onegai☆Teacher”

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Kei Kusanagi, the protagonist of the anime series “Onegai☆Teacher”, is portrayed as a shy, kind-hearted and intelligent boy. He has a strong sense of responsibility and cares deeply for his family. Kei is particularly protective of Mizuho Kazami, his teacher and later wife, demonstrating his loyalty and devotion to those he holds dear.


Living the life of a fifteen-year-old boy, Kei Kusanagi leads a seemingly ordinary existence. However, he suffers from a unique condition known as “Standstill”. This condition causes his body to enter a death-like state whenever he becomes too stressed or depressed. During a Standstill, Kei’s body shuts down and remains unresponsive for a random amount of time, ranging from minutes to hours.


Kei Kusanagi is portrayed as an 18-year-old boy, although he is often mistaken for a 15-year-old due to his stasis episodes. He has a modest height of 155 cm, and his appearance reflects his reserved nature. Kei’s design emphasizes his ordinary and relatable appearance, allowing viewers to easily relate to his character.


While Kei Kusanagi does not possess any extraordinary supernatural abilities, his strength lies in his resilience and determination. Despite the challenges presented by his paralysis, Kei strives to live a normal life and maintain his relationships. Throughout the series, he shows emotional growth and the ability to overcome obstacles through perseverance and love.


Kei Kusanagi’s story unfolds when he discovers that his new teacher, Mizuho Kazami, is actually an alien sent to observe Earth. This revelation sets the stage for a series of misunderstandings and comedic situations. At a crucial turning point, Kei is faced with the choice of either revealing Mizuho’s secret or marrying her. He ultimately chooses to marry her, and their relationship becomes the focus of the narrative, exploring themes of love, acceptance, and self-discovery.
In the anime, Kei’s journey shows his personal growth and the challenges he faces in navigating the complexities of his unconventional relationship. The series explores the struggles of balancing his love life with his desire for a normal existence, as well as his attempts to reconcile his feelings with societal expectations.
Kei Kusanagi’s character development in “Onegai☆Teacher” highlights the power of love and the resilience of the human spirit. Despite his unique circumstances, Kei’s relatability and genuine emotions make him a compelling protagonist for viewers to empathize with and root for.

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The information for this article is based primarily on Kei Kusanagi’s character profile on Additional details were gathered from various online sources, including Google searches.

Kei Kusanagi – FAQ

Who is Kei Kusanagi?

Kei Kusanagi is the protagonist of the anime and manga series “Onegai☆Teacher”. He is a high school student who becomes involved with an alien teacher named Mizuho Kazami.

How does Kei Kusanagi get to know Mizuho Kazami?

Kei meets Mizuho Kazami when she comes to his school as a new teacher. However, he soon discovers that Mizuho is actually an alien from a planet called Juraihelm.

What is the relationship between Kei Kusanagi and Mizuho Kazami?

Kei and Mizuho develop a romantic relationship over the course of the series. Despite the challenges they face due to their different backgrounds, they support and care for each other deeply.

What are some of Kei Kusanagi’s personality traits?

Kei is portrayed as a kind-hearted and caring person. He is often portrayed as responsible and mature, taking care of his family and friends. He can also be a bit shy and reserved at times.

What challenges does Kei Kusanagi face in Onegai☆Teacher?

Kei faces several challenges in the series, including dealing with his feelings for Mizuho while keeping their relationship a secret from others. He also faces social expectations and prejudices regarding their relationship.

Does Kei Kusanagi have any special skills?

Kei has no special abilities or powers in the traditional sense. However, his strong sense of empathy and understanding allows him to connect with others on a deep level, which plays a significant role in the story.