My Childhood Friend, Whom I Thought of as a Little Brother, Was Actually a Girl ~ I Unknowingly Suggested We Share a Room, and This Is How It Ended… It Seems Everything Was According to My Childhood Friend’s Plan

Native title: 弟のように思っていた年下幼馴染、実は女の子でした〜知らずにルームシェアを提案してしまった俺の末路……全部幼馴染の計算通りだったようです〜