WMG / Drug & Drop

Unmarked spoilers are ahead, per Spoilers Off rule.

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The Suiryo Boarding School job was primarily for Kazahaya’s benefit.

In volume 3, Kazahaya and Rikuo take a job at a boarding school to get a prized ring, but the arc is primarily filled with Ship Tease, Ho Yay, and Fanservice. Though ultimately the job was important for both Nayuki and Mukofujiwara, the ultimate purpose of the job was Kazahaya’s growth in two ways. The first way was that Kazahaya was able to interact with more boys his own age, as the only person he ever knew his own age before meeting Rikuo was Kei.

The second way was that it helped Kazahaya understand his own sexuality.

Given Kazahaya’s upbringing and the minimal interactions he had with people, his understanding about sexuality and relationships would be nonexistent. Thus the trip to Suiryo proved to be essential to Kazahaya understanding himself. Nayuki’s nonchalant conversations about sexuality are Played for Laughs, but after such conversations Kazahaya frequently is left with a lot of introspection. After one such conversation he even started to notice that Rikuo was attractive, but then quickly brushed the thought off. He is also encouraged by most of the student body to be with Rikuo. There are feelings clearly developing between Kazahaya and Rikuo as the series progresses between Legal Drug and Drug & Drop, even as Kazahaya (and only Kazahaya) denies that there is anything more between them. Rikuo on the other hand doesn’t need such introspection, because it’s clear that his feelings for Kazahaya before this point had already evolved.

Kakei and Saiga know that the fates between Kazahaya and Rikuo are bound together and having them at odds is not beneficial for either of them. The job at the school thus was necessary for Kazahaya, not just to meet more people his age but also to feel comfortable in his own skin with peers who had the same feelings that he was feeling. And the job allowed for Kazahaya to get a better understanding of what he was feeling towards Rikuo. And though it didn’t ultimately pay off (as Kazahaya still denies that there is anything more between Rikuo and him in Drug & Drop) their relationship in Drug & Drop has none of the hostility that it had before and the pair are far more amiable and gentle with each other.

So while Kazahaya didn’t completely embrace this aspect of himself after this job, it did however serve to help him understand himself. And this ultimately had a positive impact on his relationship with Rikuo as well.

Kazahaya was the catalyst for Tsukiko’s disappearance.

The mystery of what happened to Tsukiko has been a driving force in this series. What is known is that Rikuo came home from school and found Tsukiko missing, and their apartment splattered in blood. In Kazahaya’s first vision of the incident, he recognized a hair-clip that was sitting a pool of blood. So why did this happen to Tsukiko? There is a possibility that Rikuo and Tsukiko had enemies and these enemies took Tsukiko, but the sad truth is that neither Rikuo nor Tsukiko were the intended targets for the incident.

It was Kazahaya.

Rikuo tells Kazahaya in Drug & Drop that Tsukiko had disappeared the year prior. Drug & Drop begins one year after Kazahaya came to the Green Drugstore. Based on the timeline, it appears that Kazahaya running away from his cult community and Tsukiko’s disappearance occurred within the same year. Kazahaya left to save both Kei and himself (as the community had decided to kill one of them) but the community themselves had probably decided to kill Kei and keep Kazahaya, as Kei had become increasingly unstable. Kazahaya leaving left them stuck with Kei, which is probably what they didn’t want. As Kazahaya doesn’t want people to know where he is, the cult is most definitely looking for him.

Saiga tells Rikuo that a religious group called “Ship of the Moon” may have been involved in Tsukiko’s disappearance. Ship of the Moon may either be affiliated with Kazahaya’s cult - or Ship of the Moon might actually be Kazahaya’s cult. Regardless, they sought Tsukiko out prior to the incident, and because of the discarded hair-clip it can be safe to assume that either Ship of the Moon, or Kei herself attacked Tsukiko in the apartment she shared with Rikuo. Regardless of who it was that started the attack, the reason that it happened is because the parties were looking for Kazahaya — and either because of Tsukiko’s powers or Rikuo’s connection to Kazahaya, they went to the apartment to get answers about Kazahaya. Tsukiko either didn’t know anything or refused to give them information about Kazahaya, and thus the bloodbath occurred.

Whatever happened is not Kazahaya’s fault. But he is the reason they were there, and he is the reason Tsukiko is gone.