Yūji Tamura serves as Ichigo's stepfather in the present timeline, where his strained dynamic with Ichigo and her mother Miyuki fuels Ichigo's distress and motivates her quest to alter the past. In the past timeline, he emerges as Kyousuke Hikami's closest friend. During this era, Yūji develops romantic feelings for Miyuki, sparking a rivalry with Kyousuke, who also seeks her affection. This love triangle intensifies into a direct confrontation between Yūji and Kyousuke over Miyuki. His existence introduces pivotal conflict as Ichigo endeavors to redirect her mother's future toward her biological father, Kyousuke, rather than Yūji. Yūji's role shifts from a seemingly antagonistic figure in the present to a layered character in the past, where his friendship with Kyousuke and pursuit of Miyuki heighten emotional stakes. His decisions critically shape Ichigo's mission to transform her family's destiny.