The first work created without going through serialization in Japanese magazines, as is usually the case in the homeland. "GoGo Monster" was the sensei’s first attempt to create a one-volume work (1998-2000). Deprived of the feedback from readers that would normally come with a serialized publication, the author found himself writing this work with a completely different approach he was not used to. The story is about Yuki Tachibana, a very peculiar child with a sensitivity to reality different from that of other children. It could be said to be more developed, as he often finds himself in situations where he cannot distinguish between the two worlds,confusing what is and what is not. This peculiarity makes him an outcast at his school because the other children are either frightened by the unsettling things he says or simply consider him strange and tease him. Not everything is bad, though. The school janitor spends a lot of time with him, keeping him company and acting as a point of reference. He also makes friends with a new student, Makoto, who transferred from another school, and with IQ, an older student who constantly goes around covered by a box.

There are 5 chapters in total, divided into seasons. In this story, Matsumoto does not intend to tell us precisely what is real and what is imaginary. He leaves it up to the reader to interpret the meaning of Yuki's words. Indeed, there will be many occasions where you will wonder if what he says is true or if the child has a form of autism that causes him to have visions and say certain things.
However, the story does not only dwell on Yuki's vision of the world but also addresses how scary and cruel elementary school children can be, despite their age. We are shown how they can bring adults to their knees with their cruelty and how younger children are easily influenced by their seniors. Moreover, we also see the indifference of adults towards children and their inability to understand them, often making superficial judgments about their behavior. Of course, not all adults are painted with the same brush, as there will be teachers who, despite the difficulties, make the effort to understand their behavior, even if they ultimately fail to do so. What makes all this frightening is how accurately it represents reality, with situations that happen daily in schools.

Artistically speaking, compared to the first work I read by Matsumoto, "Sunny," it has a very nervous style that I find in line with the overall atmosphere within Yuki's school walls. Strong contrasts and some pages that are almost entirely black.

I would not recommend this manga as a first approach to Taiyo Matsumoto's work. It is deliberately a work that leaves interpretation open, at times forcing the reader to question what they are reading without ever having a clear answer. A very dreamlike and at times unsettling read, not as the joyful and innocent cover of the manga might suggest.

Personally, it was not a read that conveyed much to me, but I appreciated that it managed to stimulate in me the desire to understand what lies beyond the real world, as Yuki says, and what it means to him to rot, even though I associated it with becoming an adult and losing the innocence of childhood.