Beginning with the Ubume Bird - Chapter 359 - 6 Rapid Progress

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

Aaron, a wildlife biologist, became a military strategist right after a global war between nations began.He never wanted to participate in the war but he had to, because he wanted to continue his studies on endangered species the moment the war was over, but to his surprise, everyone in his unit were killed, including him, and the next thing he knew, Aaron woke up in the body of a young noble having a similar name to his.However, he also noticed he had awoken in a world different from Earth.In this world, demonic beasts ran rampart with only one thought in mind, causing them to feed on anyone they see, be it humans, elves or even magical beasts as well.During his first encounter with a magical beast, Aaron awakened a system which allowed him to bond with magical beasts and to obtain terrifying abilities from these bloodcurdling magical beasts, so he used his experience as a wildlife biologist to help make it easier for him to bond with these beasts.However, Aaron also noticed he could evolve these beasts if their loyalty towards him had reached a certain level, so he vowed in his heart to grow strong enough to protect those he cared about in this world with the hope of living a happy, peaceful life where he'll be able to focus fully on his passion as a wildlife biologist.

She was reborn back to 11 years ago, when everything was fine, her family was still alive and she had not experienced the pain of destruction. Since she had the chance to restart, she decided to seek revenge on those who had hurt her! She would also leverage her knowledge and strength to lead her family to a prosperous life. However, she has a regret: despite being reborn, she still ended up marrying him, a man who was difficult to approach...

“Strongest Spirit Beasts Master Family” is a fantasy novel that combines elements of adventure, magic, and family bonds. The story is set in a world where spirit beasts play a central role in society, providing magical powers and abilities to those who can form bonds with them.The protagonist hails from a renowned family, known for their mastery over the spirit beasts. The protagonist, a young and promising beast master, embarks on a journey to discover their unique powers and forge bonds with the most formidable spirit beasts.The novel explores themes such as responsibility, courage, and the importance of understanding and respecting nature. As the protagonist grows and learns, they uncover secrets about their family’s legacy and the true nature of spirit beasts. Along the way, they face challenges from rival families, dark forces threatening the balance of the world, and internal conflicts about their destiny.The narrative is filled with thrilling battles, deep connections with mystical creatures, and a rich world-building that draws readers into the intricacies of the spirit realm. The protagonist's journey is not only about mastering the spirit beasts but also about understanding themselves and the power of unity and love within a family.