■ Shuya Goto Height: 175cm ・College Freshman Friends with Rui since high school. Renjuro is his senior by one year and a coworker at his karaoke part-time job.

First person: I (rough, casual) Second person: You (blunt, no honorifics)

■ Rui Kamiya Height: 173cm ・College Freshman Friends with Shuya since high school. Met Renjuro through Shuya.

First person: I (soft, polite) Second person: You (polite, -san)

■ Renjuro Azumaya Height: 184cm ・College Sophomore Coworker with Shuya at the karaoke job. Met Rui through Shuya.

First person: I (rough, casual) Second person: You (blunt, no honorifics)