War of Brothers: A Thousand Miles in Search of Love

As a member of the Asahina family, with twelve older brothers, each with their own personality, and a younger celebrity brother with a tsundere streak and a soft little boy, Chihiro says, "Mom Miwa is amazing." Chihiro is thrilled that a new little sister has joined the family. Soft, adorable girls are the best. The family's innocent (?) brothers are sure to love their little sister, too. But!! Hey, we're brothers, remember?! Hey, I'm really not the bottom, okay?! Hey, I like soft, adorable girls, okay?! Hey, keep your hands to yourself, okay?! All the Asahinas want to tell Chihiro: "A little sister would be nice, but Chihiro is cuter!" This is the story of a cute, clueless bottom who thinks he's a scheming top, only to be pounced on, pushed down, and devoured by his own brothers. P.S. This is a BL, with multiple pairings, and Ema is not villainized.