Eiyuu to Koso Doro

1-2. Eiyuu to Koso Doro (英雄とコソ泥, The Hero And The Petty Thief)

Isaac, an injured retired Air Force pilot, was once called the "Nobleman of the Skies" due to his brilliant military service. Upon returning home, he meets a boy named Lenny who has broken into his home while it was abandoned. Isaac, knowing the boy is a war orphan, decides to take him in. Lenny, who is initially rebellious, gradually warms up to Isaac. Life is going smoothly for the pair... Until a bounty for Lenny was posted around town, accusing him of murder.

1. Bokutachi wa Koushite Hanshokushiteiru (俺たちはこうして繁殖している, This Is How We Breed)
   
2. Aishikata wo Mitsuketa yo (愛し方を見つけたよ, I've Found A Way To Love)
   
   

(Source: Gentosha, translated)