Unmarked spoilers are ahead, per Spoilers Off rule.
The assassination attempt on Enjouji on a dark, rainy day. Enjouji, who was not a gangster but just a simple high school student at the time, still had a hit put on him for no reason other than his biological father was a yakuza boss. Right before he is run down by a car, Ranmaru pushes him out of the way and is struck instead. Enjouji is left beside a severely injured Ranmaru, not knowing if he is alive or dead.
Kai goes out for a ride on his motorcycle, and on his ride he’s suddenly run down on by a Porsche. The driver, unbeknownst to Kai, was introduced at the beginning of the chapter wanted for the murder of his own sister. Both were exes of Masa. When Kai wakes up, he awakens to a nightmare alone with this person, who proceeds to rape him. If that weren’t bad enough, he starts strangling Kai in the middle of it, screaming at Kai that it was his fault that he killed his sister. Then when a call comes in on Kai’s cell phone from Masa, the rapist continues assaulting Kai with Masa hearing everything on the other line. Then when Masa finally arrives, he find Kai still tied up naked, bruised and bleeding and unresponsive. When Masa first saw Kai in this moment, he thought Kai was already dead.
Kai later opens up to Roy about what he had suspected Shinji’s endgame plan to be, which was that Masa and him kill each other in front of Kai to inflict maximum trauma to Kai as punishment for him “stealing” Masa, and so that Shinji and Masa could be together forever in death. Thankfully this did not happen, but for anyone who has read the prequel series Hana to Ryuu this is both Nightmare Fueland a Tear Jerker because a fate like this happened to Masa’s older brother Hitoshi.
The origin of Masa’s facial scar is Nightmare Fuel for how something as simple as a fight between high school students can escalate into attempted murder. A one-sided rivalry between Kai and another student quickly spirals when the latter hires yakuza to kidnap Kai’s friend Kumi and then curb-stomp Kai when he tries to rescue her. Masa and Kyousuke arrive shortly thereafter to diffuse the situation, but even after the yakuza thugs themselves tell the kid to stand down he tries to kill Kai with a sword. Masa shields him from the blow, resulting in his scar.
Adding to the Nightmare Fuel was that the kid gave the thugs permission to rape Kumi in front of Kai. Masa and Kyousuke thankfully arrived before anything could happen.
When Ranmaru and Kai try to save a kidnapped Enjouji, they find him shot and strung up unresponsive. Ranmaru reacts by sinking into a calm, murderous rage where he tries to kill the Big Bad of the story arc for hurting Enjouji. Masa stops him just in time, but the only thing that fully snaps Ranmaru out of it is Enjouji, now awake, tell him to stand down.
