Yu features in Kyoko Asahina's storyline as a fellow film club member sharing her passion for cinema. Their dynamic strains under Kyoko's demanding standards and critical nature, escalating club tensions until Yu departs, overwhelmed by her pressure. His exit sparks Kyoko's self-reflection, revealing the impact of her harsh behavior on others.

Post-departure, Kyoko evolves significantly—rekindling her film-making drive and embracing a supportive role as club captain. Yu reappears in the series' finale, coinciding with the convergence of key character arcs, hinting at reconciliation or closure.

During a professional crisis, an ardent fan of Kyoko's radio show breaks into the station intending to aid her career. Kyoko allows this individual to face legal consequences despite their professed motives. While unnamed in the incident, the fan's actions and link to Kyoko's career low point align with Yu's narrative role.