The character Ango Sakaguchi in " Wild Dog " was a spy, but Osamu Dazai was not sure about this. When he realized the identity of Sakaguchi Ango, he decided to let him go because he thought that Sakaguchi Ango was a trustworthy person and he hoped that he could help him solve some problems. Sakaguchi Ango also hoped to reveal some secrets, and Osamu Dazai believed that if he was caught, he would pose a threat to others. Therefore, Osamu Dazai decided to let go of Sakaguchi Ango to help him complete his mission while protecting the safety of the others.
Well, some characters might be amused. For example, Atsushi could be a bit shocked at first, seeing the different interpretations of Dazai in the fanfiction. He might find some of the more out - there scenarios quite strange but also interesting in a way.
Sakaguchi Ango's original text under the blooming cherry blossom tree was as follows:
Under the blooming cherry blossom trees, Sakaguchi Ango walked lightly. He wore a white robe and held a bamboo sword in his hand. His face was gentle. It was a beautiful spring day. The cherry trees were in full bloom, and the air was filled with the fragrance of flowers. Sakaguchi Ango came here to find his true love. He had been looking for someone to spend the rest of his life with, but it was not easy to find. In this beautiful spring, he decided to leave this world to find his lover. He believed that when he found her, he would come back again to reunite with his lover under the blooming cherry blossom tree.
Dazai is not based on a true story. Usually, characters like Dazai are formed through the author's imagination and artistic expression to create an engaging narrative for the readers.