Akuyaku Reijo No Otouto

Akuyaku Reijo No Otouto summary:

I, Oohira Tooru, who is reincarnated into the world of otome game for beginners, “Shirayuri no Kimi to…”, am planning to live as minute as possible behind my outstanding sister. However, I, who realize that we’ll go into destruction end if things continue this way, have to clean up after the mess that my sister keeps making. Several years have gone in this fashion… I’m only cleaning up, but somehow, I’ve raised entirely different flags from the capturable guys, leaving me bewildered. Moreover, something weird is going on with the game’s heroine…?