Katekyo Hitman Reborn! is a one-shot manga written and illustrated by Akira Amano. The one-shot was published in Weekly Shōnen Jump Issue 26 in 2004. The story introduced the main concepts of Katekyo Hitman Reborn!, and due to its success, the manga began its serialization in April 4, 2004. It was also included in Katekyō Hitman Reborn! Vongola 77.
Tsunayoshi Sawada is a 14-year-old student at Namimori Middle School. He is infamously known as "No-Good Tsuna" due to his severely low self-esteem and lack of talent in any activity. He has a crush on the most popular girl at his school, Kyoko Sasagawa.
When he arrived at his house after school, his mother, Nana Sawada, informs him that a home-tutor will teach him today, much to Tsuna's dismay. Shortly after, a baby in a black suit and fedora suddenly appeared in their house, introducing himself as Reborn, the home-tutor assigned to teach Tsuna. Upon this declaration, Tsuna immediately laughs at him, thinking it was all just a joke. Reborn immediately kicks Tsuna unconscious and brought him to his room.
Once Tsuna is awake, he explains that his true purpose is to train him to become a Mafia Boss since he is the great-great-great grandson of the first boss of Vongola Famiglia. Tsuna flat out refuses to believe it and tells him to leave. But unfortunately, Nana says that Reborn will stay here until his assignment to teach him is done.
The next day, Reborn follows him to school despite Tsuna's protests and quickly realizes his secret crush towards Kyoko when he hid behind lamp post as Kyoko passing by. Changing his chameleon into a gun, he tells Tsuna to die once and shot him on the forehead. A flame suddenly burns up from Tsuna's forehead with his clothes torn up, leaving him only with his boxers and as he revives again, he shouts that he will declare his love for Kyoko.
Tsuna chases after Kyoko and confesses to her in front of the school gate, making Kyoko embarrassed and ran away. This leaves Tsuna heartbroken and blames Reborn for what happened. The next day at school, Mochida announces Tsuna's confession to the whole class and challenges him to a competition with the one who has the higher score in the next text would be the winner with Kyoko as the bet despite the said girl's discomfort. Tsuna leaves the class in fear and discouraged as he ponders that he would never win since he is always no good. Reborn interrupts, questioning whether he is satisfied with it and tells him that he should try first before giving up. Once again, Reborn shot him with Dying Will Bullet, turning Tsuna into Dying Will Mode.
Tsuna rushes back to class and starts reading his books for the test determinedly, surprising the entire class. Done studying, the test starts with Tsuna out of Dying Will Mode and bandaged onto his chair due to to the after effect of Dying Will Mode as he does his test. The teacher gives back the result of the test. Mochida says that he got 99 points, cheering as he thinks he has won. However, Tsuna then says that he got a perfect score, 100 points, shocking everyone. The class cheers and congratulates Tsuna. Tsuna is amazed that for the first time he feels he has achieved something right. He looks back at Kyoko and is happy to see her smiling at him and inwardly thanked Reborn for his help. He goes back to his room, wanting to tell Reborn that he finally become friends with Kyoko, but didn't find him anywhere. Several days later after Reborn's disappearance, Tsuna wonders that he already left because he was able to get a perfect score because of his help. However, his thought was interrupted by Reborn's arrival who explains that he only left to get some things necessary to train him to become a great boss and proceed to shoot him again with Dying Will Bullet so they could start training. The story ends with Tsuna beg Reborn to let him rest after the continuous training in Dying Will Mode, which Reborn completely ignored.
Differences with the first chapter of the serialization manga Edit
- The other candidates for Vongola boss is never mentioned, making Tsuna the only heir.
- Mochida is not present when Tsuna confessed his love for Kyoko, delaying their duel to the next day.
- Mochida challenges Tsuna to a study competition instead of a kendo duel.