Kudoh is seen as "a calm, early-maturing youth." He is Aki's classmate and also Misao's childhood friend. The two grew apart as they became older. Kudoh distanced himself from Misao due to the fact that his class mates made fun of him for hanging out with a girl.
His appearance consists of having dark green coloured hair, which flicks in an upward motion, a fully up-buttoned shirt accompanied by a well tied tie. His overall appearance is neat. His face bares a mature and calm expression. The creator (Sen, better known as Miscreant's Room) stated he is supposed to look "gloomy" and polar opposite in personality and attitude to Tohma.
Misao - Is said to have been close with Misao in his younger years. They grew apart as he was teased in middle school for hanging out with a girl. Kudoh harshly told her not to talk to him ever again and ignored her as she was getting bullied. He says he's always loved her but Misao only saw him as a brother figure, so his love was unrequited. Although the creator (Sen) hints later that Kudoh's love was most likely sibling love.
Aki/Akito - Classmate. Whether or not they talked often is currently unknown.
Yoshino - Kudoh's classmate. Kudoh knew that Yoshino had bulled Misao, but did not take action, and condemned him to becoming a target of Misao's wrath during the curse. She is on his most hated list: 1. Tohma 2. Yoshino 3. Himself.
Before the Curse
Kudoh is first seen in the classroom with Tohma, Saotome and Yoshino, talking about the strange activities that have been happening since Misao disappeared. When Tohma says that the paranormal activities might be caused by Misao's "curse", Kudoh sharply tells him that it isn't the time for jokes. Tohma and Yoshino continue talking about the curse, and Kudoh cuts in when Yoshino asks why she would be cursed, saying that she bullied Misao a lot. Kudoh remains mostly silent for the rest of the scene.
When Aki leaves the school through the fire exit for the first time, Kudoh is found in the middle of the road, injured. Kudoh blames himself for what has happened, saying that he's sorry. The player then has two choices: Watch him, or help him.
By helping him, both Aki and Kudoh will be run over by an oncoming car, which will result in a game over.
By watching him, Misao's ghost will appear in front of Kudoh. Kudoh will then say something along this lines of "We can now be together forever" and "I love you" which is then countered by Misao's harsh words of "You're mistaken. I never liked you at all" and "Now die." Whilst proclaiming her hatred for him she disappears before he then gets run over by a car which results in his death with his final words being "MISAOOO!"
He is reborn in the Truth ending by Onigawara and is turned into a baby. He is last seen with Tohma and Ayaka being taken cared of along with baby Yoshino and Baby Saotome.