Ayumu is sleeping on the roof of his school when a girl is pushed off the balcony so he immediately becomes a suspect. His sister-in-law, Madoka is the inspector on this case and she tries to clear his name as she believes that Ayumu didn't do it. Hiyono follows Ayumu around as the school reporter trying to find information on the incident. When Ayumu tells her that he didn't do it, she helps him to reveal the real culprit. While standing on the balcony, Ayumu suddenly realizes how the girl fell and calls Madoka. They confront Sonobe, a new teacher at the school and the person who first ran to the fallen girl's aid. Ayumu explains that what Sonobe did was leave a note asking her to meet him at the roof of the school. Before that he had swapped her glasses and so when she went to the roof and saw no one there, her first instinct was to put on her glasses and look over the balcony. However, the glasses made her vision worse and she grabbed onto the tampered railing and fell. Questions arise as Ayumu and Madoka wonder what the Blade Children are, the reason Sonobe wanted to kill this girl and how he knows about Kiyotaka, Ayumu missing brother and Madoka's husband.

A murder occurs at the Shiranatagani household, the residence in which the girl pushed off the balcony is from. Madoka knows that this is more than mere coincidence, and along with her partner Wataya, goes to investigate. Meanwhile, Hiyono accidentally hears Ayumu playing the piano beautifully, but he refuses to play when she asks to play again. Hiyono then tells him about the murder at the Shiratagani, and Ayumu immediately sets his mind into action.

Back at the Shiranatagani household, Madoka and Wataya gather all the residents of the house to try and determine the suspect. The murder occurred behind closed doors, where the victim hit her head on the side of a chair and died, drawing a square spiral symbol on the floor to lead to the culprit with the last of her strength. Madoka accuses the father of the household, but discovers he is blind so he could not have committed the crime. Ayumu steps in and says the culprit is the maid. She confesses to the crime and when they question why she did it, she says that she wanted to protect the family and so she killed anyone who wanted to talk about the Blade Children as it hurt the Shiranatagani family. Ayumu and Madoka's curiosity are further peaked.

The famous child prodigy pianist, Eyes Rutherford, arrives in town for a concert. However, during a television interview he asks that "Kiyotaka's brother" be brought to him. Hiyono drags Ayumu to the concert and when they encounter Eyes Rutherford he tells Ayumu to play for him. Ayumu refuses and Eyes criticizes him and tell him how he will never be better than Kiyotaka. The words cut deep, but Ayumu does nothing but watch Eyes walk away. Just before the concert starts, Ayumu and Hiyono discover a bomb. Hiyono tells a security guard to get everyone to evacuate as in order to defuse the bomb, Ayumu has to solve the magic square puzzle (related to a turtle in Ancient Chinese mythology). Ayumu has 30 minutes to do this and Hiyono has confidence that he will pull it off. Ayumu takes a while to realize that it is a magic square and narrows it down to two possible combinations. In the last few seconds he chooses one and the bomb is deactivated. Both Ayumu and Hiyono are relieved. Watching from another building, Eyes makes a phone call and informs that Kiyotaka's brother manage to defuse the bomb. He then clutches chest as he has "the curse of Blade Children". A little later, Ayumu and Hiyono peacefully watch Eyes play the piano for the crowd.

Ayumu and Hiyono encounter Kousuke Asazuki, who challenges Ayumu to a little game. But before that, he scares Ayumu a little by releasing some bees around him. Here we learn that Ayumu is very allergic to bees and that one sting would kill him. The fact that Kousuke knows this is attributed to Kiyotaka. Kousuke throws down a knife with a note saying to meet him at the specified time and location if he really wants to know what the Blade Children are and where his brother is. When Ayumu and Hiyono arrive later, they find Kousuke sitting at a table. Ayumu slams down the knife into the table and asks Kousuke for information regarding Kiyotaka. Kousuke holds a deck of cards with the jokers removed and tells Ayumu that he has to guess which card he sets down on the table. He says that if Ayumu guesses right he will tell them whatever they want to know. If he guesses incorrectly, however, Kousuke will release the jar of bees he has, and the bees will go only to Ayumu as the note he gave him earlier is saturated with a chemical bees are attracted to. Ayumu retorts that it is near impossible to guess and that the conditions aren't fair. Kousuke then says that he will give Ayumu 3 guesses and then adds that Kiyotaka would have only needed one. This makes Ayumu agitated and he says that he can guess it in one as well, despite the protests of Hiyono. After doing some logical thinking Ayumu guesses that the card on the table is a Joker. Kousuke asks whether he is sure, but Ayumu is positive and flips the card to reveal...a joker. Hiyono is very impressed but Kouske simply smirks. Ayumu then demands that Kousuke tell them what they want to know now. However, Kousuke tricks them into stepping into a room and locks them in, releasing the bees. Ayumu and Hiyono manage to escape, much to the surprise of Kousuke. Ayumu had jammed the door lock with the note. The situation ends with Kousuke not telling them anything and Ayumu revealing to Hiyono that he wasn't as smart as his brother at all, but rather had seen the card reflected in the blade of the knife when Kousuke had put it down.

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Ayumu and Hiyono go to the hospital where Rio is recovering after she blew herself up. Kousuke is there as well and the two groups play off each other, each one outsmarting the other with every discovery. During this confrontation, Ayumu is given a challenge. There are two cups of water and two sachets of powder. One contains sugar, and the other a deadly drug. Rio pours a sachet into each cup, and states that even she doesn't know which is which. She then states that if Ayumu truly is Kiyotaka's brother, he will dare to pick a cup to drink. Rio even offers him first choice. Ayumu agonizes over this for a while and then accuses Rio of tricking him. He claims that neither cup actually has any poison and both are sugar. With that he picks up a cup and lifts it to his mouth. But upon tasting it, he slams the cup back down as the fluid is bitter. Ayumu is shocked as he can't believe there truly was poison in one cup. Rio and Kousuke smirk as Rio says it is just like him to doubt his theory and only taste it first. Rio drinks the other cup and continues to undermine Ayumu's confidence in himself. Hiyono, however, believes that Ayumu's theory could not be wrong. To the shock of everyone, Hiyono takes the cup Ayumu originally had and drinks it all. Everyone watches her intensely, but to Ayumu's amazement she is fine and states that it was only bitter cold medicine. Rio is displeased that Hiyono saw through her, and says that Ayumu didn't win anyway as he didn't believe in himself. Hiyono, however, has been taping the entire conversation, including the part when Rio confesses her crimes. Kousuke leaps for the tape, but Hiyono throws it to Ayumu and tells him to run. After some hesitation, Ayumu flees, disgusted with himself.

Since Kousuke and his team are holding Hiyono hostage, Ayumu knows that he must persevere in order to save Hiyono. But Ayumu is extremely depressed as he feels that he simply abandoned her. He calls Madoka, who has been worrying about him at home, and tells her he won't be home tonight. Madoka, afraid that he will just disappear like Kiyotaka did, makes him reassure her that he will be home soon. Ayumu spends the night thinking and feeling bad for running out on Hiyono like he did. He finally seals the tape in an envelope and puts it in a postbox (he's mailing it to himself). There's also a very beautiful scene in this episode when Madoka comes to find Ayumu and comforts him by hugging him and telling him that he is different from his brother. ^_^

Ayumu knows that Rio and Kousuke want the tape, so he arranges for a trade. But this trade is complicated and full of twists, and both teams continually outwit each other. Rio and Ayumu meet in an empty church to discuss the conditions. All four participants are given cell phones to contact each other to discuss tactics. However, Rio insists that Ayumu has to wear a collar around his neck. The collar is a bomb which cannot be deactivated without a key, which, at that moment, Kousuke was giving to Hiyono elsewhere. Rio then says that now he will have to choose between getting to Hiyono so he can deactivate the bomb, or getting to the tape which he has told Rio will not reach his house until a certain time. The bomb is set to go off at around the same time. Rio also tells him that Kousuke will give Hiyono a little time to get away from them. Ayumu agrees to the conditions and gives Rio his mailbox key. The game starts and both teams move quickly.

Continuation of the trade...SUMMARY COMING SOON

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SUMMARY COMING SOON