The Final Odyssey, the fantastical journey of a cat boy

This is the second millennium since the end of the old civilization... The once glorious human civilization has left behind only countless ruins and relics on Earth. On this increasingly hot and barren planet, a group of "new humans" with animalistic features, including beast ears and tails, now live. Fish, a young boy from this new human race who has lost all his past memories and whose origins are shrouded in mystery, can only live in the lower rungs of an atoll city, but he has always harbored a strong desire to explore higher and farther places. Fortunately, by chance, Fish obtains a set of intelligent combat armor called "Phoenix Flame." This special combat armor not only has many amazing abilities, but also possesses self-awareness and... a rather difficult temper to deal with. This is a science fiction light comedy story about a confused cat-like boy and his sarcastic combat armor teammate who continuously collect various reliable and unreliable companions on their journey, and overcome all difficulties and reverse their dark fate with courage, friendship, wisdom, and... a little bit of good luck.