Haibara's Teenage New Game+ Volume 8

As Natsuki’s (second) first year of high school nears its end, the impact he’s had on his surroundings is becoming more apparent. His friends are making unexpected decisions as they begin to think about their futures. In his previous life, Natsuki had no idea that Nanase used to play the piano, but in this timeline she’s determined to take another shot at her dream of becoming a professional pianist. Natsuki and Hikari are excited to cheer their friend on at her first competition in years, but there’s something about Nanase’s demeanor that makes them uneasy... Are all the changes Natsuki has caused positive ones? Or has he thrown a wrench into his friends’ lives?

[From J-Novel Club]