Tousei Aoe hails from a wealthy family with significant business interests. His mother abandoned the family when he was young, an event that fractured his development and instilled lasting emotional issues concerning women and relationships, establishing deep-seated conflicts that influenced his later interactions.

Following the presumed death of Benio Hanamura's fiancé, Shinobu Ijuin, Tousei forms a significant connection with her. Moved by her circumstances and demonstrating unexpected compassion, he proposes marriage. This proposal arises from personal affection intertwined with his complex understanding of duty, familial obligation, and his own unresolved emotional struggles, revealing a protective aspect in his willingness to provide stability during Benio's grief.

Tousei navigates a complicated emotional landscape where his initial resentment toward women, rooted in maternal abandonment, gradually transforms through his relationship with Benio. Her eventual decision to marry him—motivated partly by a desire to secure stability for Shinobu's displaced parents—places Tousei in a position where he must reconcile his feelings with external responsibilities, underscoring his role in upholding social and familial expectations during upheaval.

After Shinobu's unexpected return and recovery, Benio's enduring attachment becomes clear. Tousei ultimately acknowledges this bond and releases Benio from their engagement. This pivotal moment reflects significant personal evolution and his capacity to prioritize Benio's happiness over his own aspirations, marking a departure from earlier attitudes shaped by past trauma. The resolution allows him to confront his feelings about his mother's abandonment, facilitating a psychological shift toward acceptance.

In his final narrative stages, Tousei channels his focus toward his business ventures with renewed dedication. This professional commitment represents a pragmatic redirection of energy and a symbolic step toward self-redefinition beyond previous emotional constraints. Concurrently, his journey illustrates quiet resilience in adapting to profound personal disappointment while maintaining dignity, concluding with an implicit emphasis on forward momentum through enterprise.

Personality assessments describe him as assertive, direct, possessing a strong sense of justice, and leadership tendencies, manifesting in decisive actions especially concerning Benio’s welfare. He also harbors a passionate interest in photography, often utilizing this skill to document meaningful moments for others, revealing a nuanced, observant dimension beyond his dominant exterior. His protective instincts extend to those he considers close.