Bokurano

Bokurano is a science fiction anime series first aired in 2007. Based on Mohiro Kitoh's adored manga series of the same title, the anime version is directed by Hiroyuki Morita, a man renowned for his distinguished work including Studio Ghibli’s "The Cat Returns". The 24-episode odyssey was produced by Gonzo, the studio known for their other popular shows like "Hellsing" and "Full Metal Panic!".

Set in our world, Bokurano introduces us to 15 young leads who are to face stark realities beyond their comprehension. The story opens with the main characters, a group of middle schoolers on a summer camp, discovering a hidden cave while exploring the beachside for building material for their dinghy. In the sealed cave, they meet a strange man called Kokopelli who urges them to sign a contract by way of a playful dare, on the pretext of participating in a game where they would have to pilot a gigantic robot named Zearth to combat invader enemies.

Ironically, this group, unaware of the dire consequences, signs this agreement only to learn that the 'game' is a Sisyphean battle for the survival of their universe. The turning point in the anime is when these children realise the bitter truth that the game is no ordinary one, but a life-and-death struggle against extraterrestrial entities out to destroy their Earth. This game comes with a deadly catch. Little can they comprehend the real cost of the contract and the irrevocable commitment they signed up for until they win the first battle.

Bokurano's narrative conceit generates a grim exploration of mortality and moral conundrum. Following the structure of the game, one child pilots Zearth in each battle, making life or death decisions, with lessons learned, consequences faced, and humanity tested. The show enthralls with its individual character arcs, where each episode blindsides the viewer with the character's family background, their personalities, their dreams and what they stand to lose in their fight.

Morita's keen eye direction allows the audience to immerse in each character's life through clever storytelling and visuals. He takes the viewers through the anxieties, hopes, and dilemmas the children face while granting some poignant reflections on life. The somber but captivating exploration of the human condition set amidst the most challenging of circumstances is one of the show's greatest strengths.

Bokurano is also laudable for its high artistic value, from refined character designs to the detailed backgrounds. An iconic feature of Bokurano is the gigantic Zearth, which stands out with its unique mecha design, not just in its appearance and size but in its symbolism.

Moreover, the series is well-crafted and portrays its existential themes through exquisite sound design. The background score beautifully complements the show’s theme, intensifying the viewers’ emotional connection. The series is also known for its hauntingly beautiful opening song, "Uninstall," by Chiaki Ishikawa, that complements the series' melancholic theme and embeds itself into the viewer’s memory.

However, Bokurano isn't wholly melancholic or grim; it equally acclaims life and relationships. It acknowledges the harsh realities, highlighting the immense strength and resilience of these children, coming to terms with the imperfection of the world around and continue to fight despite knowing the inevitable.

The show’s greatest strength is that it raises thought-provoking questions about morals, responsibility for one's actions, and dealing with existential concerns beyond the usual realm of adolescent problems. It invites viewers to confront uncomfortable topics concerning mortality and the sacrifices needed to protect what one cares about.

In essence, Bokurano is more than just a mecha-action or a group of kids saving the world; it is a deep-seated, psychological drama that zeroes in on the human spirit's resilience and coming-of-age under dire circumstances. It's an unforgettable journey of decisions, sacrifices, responsibility, and realizations despite the impending doom, making it one of the most thought-provoking series of its era. The show stands out owing to its profound exploration of individual growth amidst crisis, its bleak yet humanistic perspective and, of course, its unforgettable characters. Despite its dark themes, Bokurano's striking narrative remains etched in viewers' memories long after watching, cementing its place as a standout series in anime history.