Assuming this is the work in question (authored by Shisui, illustrated by Shiren), here is a breakdown of useful themes and "paper-worthy" discussion points regarding the series. 100 Days Of Code - The Complete Python Pro Boot... Site
Full Title: Ane ga Kentei de Imouto ga Tensei shita node, Ore, Heroine to Kekkon suru Koto ni narimashita? (Since my sister passed the exam and my little sister reincarnated, am I going to marry the heroine?) 13 Kimmy Granger Desperate Sister Gets Black Extra Quality Site