Shingo Wakamoto is portrayed as a moody and somewhat self-centered individual, often voicing the more pessimistic or cynical viewpoints among the group of five boys. He tends to act impulsively and is known to prioritize his own interests, occasionally making decisions that undermine the unity of the group. This self-serving streak frequently puts him at odds with the others, especially during critical moments of their imprisonment.

Among the five, Shingo is notably lecherous, readily participating in schemes to spy on the girls such as the infamous attempt to infiltrate the female bathhouse. He displays a certain narcissistic flair, taking pride in his appearance and even requesting hair pomade as a prison gift, underscoring his concern with maintaining his image even in confinement.

Although generally loyal to the group, Shingo is also prone to hypocrisy. He has moments where he betrays or criticizes others particularly Kiyoshi for actions he himself has committed, demonstrating a lack of self-awareness. He is also easily frustrated and sulks when situations don’t go his way, often leaving his cell messy and openly complaining about extended prison sentences.

However, Shingo’s personality undergoes a subtle but meaningful change after he develops feelings for Anzu Yokoyama, a former member of the Underground Student Council. Her kindness and sincerity help him become more thoughtful and emotionally mature, giving him a more hopeful and grounded outlook as the series progresses.

Shingo Wakamoto is a teenage boy of average height and build, with light skin and short, spiky blonde hair styled with gel, giving him a rebellious, delinquent-like appearance. His consistently open shirt collar and lack of a tie further contribute to his rough-around-the-edges image. Physically, Shingo possesses the least muscle mass among the five boys, and only Jouji Nezu is shorter in height.

He typically wears the standard Hachimitsu Academy school uniform, albeit in a more casual and nonchalant manner, reinforcing his laid-back and slightly defiant personality.

Anzu Yokoyama
Anzu Yokoyama, a former member of the Underground Student Council and Captain of the Guards, becomes the object of Shingo’s romantic interest. Initially captivated by her gentle and sincere personality, Shingo gradually develops genuine feelings for her. Anzu’s influence plays a pivotal role in his emotional growth, helping him become more considerate and mature compared to his previously selfish and impulsive behavior. Their relationship marks one of the few heartfelt dynamics in the series and is a key factor in Shingo’s character development.

Kiyoshi Fujino
Shingo and Kiyoshi have known each other since middle school, establishing a friendship that predates their time at Hachimitsu Academy. Despite occasional conflicts particularly when Shingo acts out of self-interest or judges Kiyoshi unfairly their shared history forms a foundation of trust. As the series progresses, their bond is tested but ultimately endures, reaffirming Shingo’s loyalty beneath his flaws.

The given name Shingo (真吾) is composed of the kanji 真 (shin), meaning “true” or “reality,” and 吾 (go), which can mean “I,” “my,” or “one’s own.” Together, the name may be interpreted as “true self” or “genuine person,” reflecting a possible thematic contrast with Shingo’s often hypocritical or conflicted actions throughout the series.

His surname, Wakamoto (若本), combines 若 (waka), meaning “young,” “immature,” or “perhaps,” and 本 (moto), meaning “origin,” “main,” or “true.” The name may loosely translate to “youthful origin” or “immature truth,” a fitting nod to his journey from a self-centered troublemaker to a more mature and emotionally grounded individual.