In "Lyra's Magnum Opus", Sana and Tetsu don't have a lot of conflict in the traditional sense. The only real conflict is when Tetsu is worrying about Sana feeling ill. One major conflict comes when Tetsu knows he was the direct cause of Sana having the worst asthma attack he's ever had. They were vacationing in Okinawa with Sana's band, Lyra. They were waiting outside of an antiques store, trying to figure out where the other band members were. Tetsu was on the phone with his mentor, Keitaro, who was with the band as a mentor. This phone call went on for a long time as they were outside under an awning. The humidity was over 90% in the summer sun, and it was raining. This triggered a slow burn asthma attack in Sana, which he didn't realize until they'd all gotten to their destination which was a bowling alley. They were enjoying themselves, and suddenly Sana looked like he fell asleep. Silently, Sana got into such physical trouble. At the hospital, Tetsu panics, realizing that it must have started as they waited outside. He blames himself, and Sana's friends try to assure him that it'll be alright. Tetsu wails, "but, I'm responsible!" Double meaning that he's responsible for Sana and responsible for Sana's problem that day. The band had just learned on that trip how little Sana can now do for himself as his degenerative condition worsens. They're all still in shock, and so they're devastated that this could happen and Tetsu feels like he's to blame. They try to assure him that he's doing the best he can, and he should be celebrated, not blamed. After Sana recovers, he holds Tetsu tightly in bed. Still weak, but loving him. Trying to show how much he loves and appreciates him, rather than words which he can't say at the moment. Tetsu had been warned previously by Sana's best friend and drummer, Yami, that Sana is highly sensitive to humidity and heat, so Tetsu blames himself.
