Oneechan / Neechan is older sister Oniichan / Niichan is older bother. C: The O part is just honorific. It's totally cool haha. I only took like two years in highschool myself but I forgot most of it. D; I was such a lazy student. OTL Anyways lurkage is always cool, and nice to meet you. C:
Isn't it Nii chan? I only took 2 years of Japanese though so idk about honorifics Sorry for the lurkage<3