Boys' Love Novels Fall into that sky DARIA BUNKO

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After his mother died, Ren lives with his father-in-law and his younger sister who is an elementary school student, but his father-in-law left a huge debt and ran away.
He dropped out of high school and supported his life with a part-time job, but since his younger sister little younger sister, he stayed with his older brother, YOSHIMUNE, who runs a large company.
After more than 10 years of separation due to the divorce of his parents, Ren doesn't really feel as much as a brother, but when Yoshimune says, "I don't think you are a younger brother," Ren is worried and can't hate his older brother even though he opposes.