"If He Becomes in the First Grade of Elementary School" is a manga that explores the concept of age regression through a unique and comedic lens. The protagonist, a 30-year-old man named Shouichi, suddenly finds himself transformed into a first-grade elementary school student. This abrupt change occurs without explanation, thrusting him into a world where he must navigate the challenges of childhood while retaining the memories and mindset of an adult. The narrative balances humor and introspection as Shouichi grapples with his new reality.

Shouichi’s transformation affects every aspect of his life. He must attend elementary school, interact with classmates who are genuinely children, and adapt to the routines and expectations of a child’s world. His adult perspective often clashes with the innocence and simplicity of his peers, leading to comedic misunderstandings and awkward situations. Despite his initial frustration, Shouichi begins to rediscover the joys and struggles of childhood, offering a nostalgic reflection on the innocence and curiosity of youth.

The manga also delves into Shouichi’s relationships with those around him. His interactions with his teacher, classmates, and even his own family are complicated by his dual identity. While his family sees him as a child, Shouichi struggles to reconcile his adult memories with his current physical state. This dynamic creates both humorous and poignant moments, as he attempts to maintain his dignity while being treated as a child. The series also introduces other characters who play significant roles in Shouichi’s journey, including classmates who challenge his preconceptions and a teacher who becomes a source of support and guidance.

The plot progresses through episodic adventures that highlight the absurdity of Shouichi’s situation while also exploring deeper themes of identity, growth, and the passage of time. Each chapter presents new challenges, from school projects and playground antics to more personal struggles, such as dealing with the loss of his adult independence. The manga’s tone remains lighthearted, but it occasionally touches on more serious topics, such as the pressures of adulthood and the fleeting nature of childhood.

Overall, "If He Becomes in the First Grade of Elementary School" combines humor, heart, and a touch of surrealism to create a story that is both entertaining and thought-provoking. The protagonist’s journey through this unexpected transformation serves as a vehicle for exploring the contrasts between childhood and adulthood, making it a unique addition to the genre of age-regression narratives.