Attempts to find responsible adults lead to deadly booby traps.
Upon recovery, he finds himself in the principal's office, now the safe room of Class SSS, Yuri's group.
He is introduced to all the members, and introduces himself as Otonashi, but can't recall his given name.
The opener is unusual in that the piano part of the music is being played by one of the characters on a Grand Piano.
Otherwise, shots of a number of characters, in high school uniforms. They seem more... armed... than most high schoolers.
The pianist has angel wings.