Not really bromance but the grandfather is such an awesome character, love their familial relationship. Not very into the harem aspect in recent chapters, but the characters all have good personalities and developments.
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
The Undefeatable Swordsman