Reborn As A Balloon monster

Sato, a 31-year-old living a modest life in a rental apartment, supports his family of six. Working at a car dealership due to a friend's connection, he feels overshadowed by his boss, Kota, a wealthy and popular figure. Sato's envy grows when Kota introduces his wife, Ai. Feeling out of place, Sato attempts to leave but ends up taking a walk with them. During the walk, Sato saves a woman and child from an oncoming truck but sacrifices his life in the process. As he lies dying, Sato expresses gratitude to Kota and admiration for Ai, leaving behind a legacy of selfless acts.