Title: No. 6
Shion is an elite student in the perfect city of No. 6. Because he excels, his family is afforded luxury and benefits provided by the city through a caste-based system. However, one evening, when Shion feels the urge to throw open his bedroom balcony doors and scream out into the typhoon outside, he inadvertently calls over a mysterious and disheveled young boy named Rat. It turns out Rat is a fugitive and has just escaped from prison.
Despite Rat admitting to being a criminal, Shion takes the time to take care of Rat's wounds and encourages him to stay. Though Rat warns Shion that this could hurt Shion and his family, Rat acquiesces and stays the night with Shion. The following day, Rat is gone. The police of No. 6 drop in to question Shion and his family over the missing fugitive, and when Shion admits to aiding Rat, his family is punished by dropping in the caste system. As a result, Shion and his mother are forced to move out to the poor parts of No. 6, and Shion is unable to move up in academics and is forced to take a more labor-based position.
Even though years have passed since their first encounter and Shion has suffered greatly. As a result, Rat isn't far from Shion's mind. It isn't long before they are reunited, though, as Shion is faced with what could only be described as the impending destruction of No. 6 as society knows it. While at work, Shion and his coworker discover the body of a seemingly elderly man. However, while in their office, Shion's coworker suddenly begins to age rapidly and dies in front of him, leaving behind a corpse and what appears to be a bee or wasp. Police immediately swoop in to arrest Shion for murder, only for Rat to rush in and whisk Shion away outside of No. 6, where people suffer to survive, all hoping to one day be granted entrance to No. 6.
There, Shion must face the fact that No. 6 is nothing more than a beautiful facade hiding conspiracy and corruption. Shion also must face the fact that while Rat is his savior, Rat has his own painful past – a past that pushes him to seek revenge against No. 6, even if that means mowing down everyone living behind its safe walls. Shion wants to uncover the corruption of No. 6, protect Rat, and protect the innocent citizens of No. 6, but can he when Rat plans to crush it all, no matter the cost?