context: Saigo no Yakusoku (The Last Promise) is a Japanese TV film drama special starring the members of the boy band "Arashi" in their first acting project together in nearly ten years. The story begins by the introduction of five seemingly very different young men and their reasons for being at the Energy Bio Corporation building: janitor Satoru Mashiko (Satoshi Ohno), motorcycle courier Nozomu Got (Jun Matsumoto), coffee shop employee Akira Tanada (Masaki Aiba), insurance salesman Yukio Tomizawa (Sho Sakurai) and security center employee Shji Yamagiwa (Kazunari Ninomiya). Without warning, a masked gunman suddenly appears on the TV monitors in the lobbies on each floor of the high rise and announces that he and his allies have hijacked the building, everyone inside is a hostage, and that a bomb that will go off in ninety minutes should Energy Bio Corporation President Niimi (Masahiko Tsugawa) not arrive with the ransom. Before she is locked in the rest of the hostages in the fifth floor lobby, Yuriko Niimi (Meisa Kuroki), the daughter of the president, manages to slip away into the stairwell of the building along with motorcycle courier Got. Prior to the lockdown by the masked men, coffee shop employee Tanada found a hiding place in a nearby supply room and has been keeping in contact by cell phone with Niimi and chief detective Genji Morozumi (Yukiya Kitamura) at the police station. Meanwhile, Yuriko quickly collects company data that is worth more than the ransom money. She confesses to Got that she believes her father isn't concerned for her safety at all and that he's only interested in saving his company. In turn, Got reveals a bit of his own past and how his trusted friend died ten years ago. The electricity in the building is momentarily cut off, which allows most of the hostages to escape. This gives security manager Shinichir Okanaka (Naohito Fujiki) the opportunity to distract the gunmen while security employee Yamagiwa opens the doors on the second floor, allowing more hostages to escape after the power returns. Though they are given the chance to leave by a basement exit, janitor Mashiko and his older mentor Haruo Iio (Kazuki Kosakai) choose to remain in the building. As the doors of the lobby are closing again, Got tells Yuriko to escape while he fights with one of the hijackers. Yuriko hestitates then moves toward the doors, only to stop when she hears a gunshot and sees Got collapse. Another gunman appears and she attacks them, nearly taking both of them down, but she is knocked unconscious and taken away by the terrorists. Meanwhile, as the only other two still trapped in the lobby, company employee Fuyuko Todoroki (Nene Otsuka) reveals to insurance salesman Tomizawa that her father died after taking a drug handled by Niimi's company. Soon afterward, the pair are escorted from the lobby by the gunmen. At police headquarters, Detective Morozumi finds out that the phone number Tanada has been using to keep in contact with him actually belongs to a young man who also died ten years ago. Finally, Niimi arrives at the building with the ransom money and is immediately taken to the security room by the hijackers, where Yamagiwa, Okanaka, Yuriko and Fuyuko are tied up. One of the four gunmen informs Niimi that all they really want is for him to publicly admit that his company handled lethal medicine that killed their friend and Fuyuko's father a decade ago. At Niimi's demand, the terrorists remove their masks and reveal themselves to be Mashiko, Tomizawa, Tanada and Got. Okanaka announces that he knew there were only a total five gunmen, with Yamagiwa being the fifth who oversaw the operation. Although Niimi initially refuses to admit that he distributed the drug while knowing the risks, he relents and Yuriko decides to stay by her father's side. Niimi apologizes to her and then confesses to the media. After Okanaka agrees to erase the security data which could be used as evidence against them, the five young men escape through the air ducts and into the basement. However, Mashiko realizes that he does not have the key to the cleaning van, only to find that Iio left it on the windshield for him. They escape capture and arrive at their departed friend's gravesite on a hill some distance from the building. The five friends watch and wait as the timer on the bomb reaches zero, which turns out to be just a festive fireworks display. Their celebration is short-lived, however, as they are surrounded by the police. With the death of their friend finally avenged, they are able to move forward with their lives, so Mashiko, Tomizawa, Tanada, Yamagiwa and Got quietly surrender.
question: Who is the chief detective?
answer: Genji Morozumi