Zenitsu Agatsuma/Synopsis

History
When Zenitsu was a young boy, he was financially supported by a woman who owned a lot of debt. She had eloped with Zenitsu, which got him into trouble and it was 'Gramps', the former Thunder Pillar, who saved him from the trouble.

Gramps decided to train Zenitsu along with his eldest disciple, Kaigaku. On one of the days during his training, Zenitsu climbed up a tree because he felt that he was disappointing Gramps, when suddenly, a stroke of lightning hit him, causing his hair to turn blonde.

Zenitsu and Kaigaku hated each other; however, Zenitsu respected Kaigaku and treasured him. Zenitsu eventually wished to fight alongside Kaigaku one day, and thus he created a seventh style, '' 'Breath of Thunder, Flaming Thunder God'. ''

Final Selection Arc
Zenitsu is first seen at the begging of the Final Selection at  Mt. Fujikasane.

After the Final Selection, Zenitsu is among the four people who have passed. Zenitsu is seen talking to himself; fearing he will die one day. Each one received a Kasugaigarasu; except Zenitsu who got a sparrow. All four are told to choose what ore they want their sword made out of.

Drum House Arc
Zenitsu is seen begging a random girl to marry him. Tanjiro stops Zenitsu, and excuses the girl. Zenitsu explains that he must get married before his next mission, because he might die; he asks Tanjiro to protect him until he gets married. Tanjiro asks him why he became a Demon Slayer. Zenitsu got swindled by a woman, and racked up debt. An old man paid off his debt, and trained him. Later on, the two share a rice cake as they travel to the south for their next mission. Zenitsu and Tanjiro arrive at a large house in the woods. Tanjiro smells an unfamiliar scent, and Zenitsu hears a strange sound. There are two kids nearby, frozen with fear: Shoichi, and Teruko. Tanjiro shows them Zenitsu's sparrow; to try and calm them. The kids tell them about a monster who has taken their brother inside that house, and that they tracked the monster here. Tanjiro ensures them that him and Zenitsu will rescue their brother, and defeat the monster.

Zenitsu asks about a non stop sound of a tsuzumi strike. Once the rest finally hear it; a bloody body is thrown out of the house, and lands infront of them. The body is not that of the children's brother. Tanjiro leaves his box with the two kids for protection. Although Zenitsu refuses to enter the house at first; he forces himself to join Tanjiro.

Once inside; Tanjiro tells Zenitsu about his broken bones that haven't healed fully yet. Which scares Zenitsu even more, since he can't rely much on Tanjiro for protection. The two kids are frightened by scratching coming from the box, and come inside the house after Zenitsu and Tanjiro. The house begins to rumble, and Tanjiro and Teruko are teleported to a random room in the house; while Zenitsu is left with Shoichi. While searching for the exit, Zenitsu and Shoichi find Inosuke; who runs past them. A scared Zenitsu and Shoichi wander through the house when a demon sneaks up on them. A demon corners the two in a room, and Zenitsu passes out from fear. As the demon tries to strike them; Zenitsu cuts his tongue off. While unconscious; Zenitsu quickly defeats the demon. Zenitsu wakes up with no recollection of his actions, and thanks Shoichi for defeating the demon.

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Зеницу Агацума