Yannie's manga / #Brothers X Sister(2)

There isn’t actually a seggs part but the girl got to choose between her two older brother and one younger brother (not actually young maybe 2-3 years younger than her). But in the end she choose her oldest brother (a doctor) and got registered for marriage. I don’t actually know if their relationship is step siblings or half siblings.

Her brothers friends was actually her biological brother then the three brothers was her adopted older brothers. It’s just sad that the seggs part is not detailed