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Tanjirou Kamado just find out that his younger brother and the first year middle school student, Takeo got put in detention by the P.E teacher, Giyuu Tomioka. The first year high school student was worried if their mother asked about Takeo's whereabouts since he doesn't have club activities today, so Tanjirou doesn't have any choice but to "rescue" Takeo from detention.
And Tanjirou also "recruiting" two of his classmates, Inosuke Hashibira and Kabuto Hokari for this "dangerous mission". Another one of Tanjirou's classmates, Zenitsu Agatsuma refused to help them since he's a morals officer and he even threatened to tell about this to Tanjirou's parents, so that's why Kabuto was chosen as temporary replacement. Inosuke gave his signature "pig assault" to Zenitsu for that.
(Flashback)
"No! No way I'll help you!" Zenitsu strongly refused.
"Please Zenitsu, I beg you!" Tanjirou pleaded. "I'll buy an expensive bird seed for Chuntaro!"
"Don't try to bribe me! I'll tell Nezuko-chan and your parents, Tanjirou!" Zenitsu threatened.
"How could you refuse to help Tontaro, Monitsu!" Inosuke shouted.
"I don't care! I would rather sit quietly in the class than getting punched in the face by Tomioka-sensei!" Zenitsu shouted back.
"PIG ASSAULT!"
"Aaaaargh!" Zenitsu screamed in fear.
Inosuke just knocked out Zenitsu with his pig assault.
"Myyy bellyyyy" Zenitsu moaned in pain before fainted.
(End of flashback)
Tanjirou slowly peeked inside Takeo's classroom. Takeo sat on his desk with such a gloomy face. Giyuu meanwhile was fallen asleep on the teacher's desk, unaware of the trio's presence.
"Good thing that Tomioka-sensei was asleep" Tanjirou exclaimed.
"Then let's go now!" Inosuke said.
"Please shut your mouth, boar!" Kabuto scolded.
"Takeo!"
Takeo turned his face towards the door. He was shocked when he saw Tanjirou with Inosuke and Kabuto was standing near the door. Kabuto even bring a light green bucket with him.
"Nii-chan!"
"Keep quiet, Takeo! Tomioka-sensei will hear you!" Tanjirou whispered. "Quick! Take your bag and come with me! Bring your bag too!"
Takeo was uncertain at first if he should escape detention or not, but since Giyuu was sleeping, he encouraged himself to do it.
As Takeo took his bag and carefully exited the class without waking up the fearsome teacher, Kabuto entered the class before covering Giyuu's head with a bucket. Inosuke tried his best to not laughing when he watched the scene.
"Mission accomplished!" Kabuto whispered as he gave a thumbs up towards his friends before exited the classroom.
"Yes!" Inosuke jumped in excitement.
"Inosuke, shut up!" Tanjirou tried to silence him.
"Okay, let's go from here before he wakes up!" Kabuto said.
The boys then quickly sprinted away from Takeo's classroom.
...
Giyuu slowly opened his eyes as he felt everything was dark out of sudden. He then realized that someone just covered his head with a bucket.
"Wait a minute, who puts a bucket on my head?" Giyuu asked himself as he quickly removed the bucket from his head.
Out of sudden, he just noticed something was wrong.
Takeo Kamado just "vanished" from his classroom.
"He's...running away!?" Giyuu widened his eyes as he raised from the chair.
Giyuu finally realised it. He knows it must be the work of Takeo's older brother, Tanjirou.
"I'll get both of you later..." Giyuu closed his eyes in anger as he slowly clenched his fist.
And later in the evening, Giyuu came to the Kamado family's bakery and complained about what happened earlier to their parents.
The end.