Teenager Yamato Akitsuki has moved from the Hiroshima countryside to Tokyo to begin his high school career. In return for room and board, he has agreed to help his aunt and cousin run their bathhouse and the adjacent girls-only dormitory where he will be staying. On his way to meet his relatives, he passes by a local high school track and is mesmerized by a high jumper practicing her technique. Later on, Yamato finds out that the high jumper is not just another resident of the dorm, but is also his neighbor. Suzuka Asahina is a heavily scouted track and field athlete who is attending the same high school he is enrolled in. A perfectionist by nature, Suzuka is put off by Yamato's clumsy and carefree attitude and finds it difficult to be near him. Determined to win her over, Yamato joins the track team after discovering his hidden talent for sprinting. Through his interactions with the track team, his classmates, and the ever-inebriated college students in the dorm, Yamato finds the resolve to become a better athlete and a more suitable companion to Suzuka, even if it means pushing himself to the point of exhaustion.

Ron Kamonohashi, the best student in the history of the elite Detective Training Academy BLUE, has been living as a recluse since BLUE expelled him five years ago. Moreover, he is forbidden to work as a detective, having barely escaped execution after getting involved in a murder case while he was still attending the school. Ron's situation changes drastically when police detective Totomaru Isshiki, following the advice of a senior colleague, seeks him out for help with a criminal case that has remained unsolved for months. Ron reluctantly agrees to help Totomaru and uses his phenomenal intuition to discover the culprit in less than a day. However, it appears that Ron suffers from a mysterious condition that can cause those around him to lose their lives. To Ron's great surprise, Totomaru manages to save the life of someone whom Ron put in jeopardy. As the unlikely duo starts solving crimes one after another, BLUE sends operatives after its former student to find out if he has resumed investigative work. Fighting against murderers, rogue detectives, and the Metropolitan Police Department, Ron and Totomaru must join forces if they want to survive and see justice prevail.

Following Inu no Taishou's death, his swords Tenseiga and Tessaiga were passed on to his sons, Sesshoumaru and Inuyasha respectively. However, there exists one more blade. During a visit to his friend Kagome Higurashi in modern times, Inuyasha encounters Sounga—his father's third sword. Found by one of Kagome's ancestors inside the old well that connects the past to the future, Sounga has been kept for years as a treasured artifact at the Higurashi shrine. Nevertheless, it soon reveals itself to harbor an evil spirit with a terrible urge to kill. While struggling to subdue its calamitous nature, Inuyasha manages to bring Sounga back to the feudal era where he must confront his brother Sesshoumaru, who has always desired to possess it. But when they lose track of the sword during their fight, the siblings engage in a fervent competition to find it, still unaware of its secret and the legacy that Inu no Taishou has left for them.

Recap of episodes 14-25.