Onee-San Is Invading!?

Explore the captivating world of Onee-San Is Invading!?, a captivating manga that masterfully blends Adult, Ecchi, Romance, Seinen, Slice of life. Created by the talented Sanri Yoko. Experience this thrilling series for free at MangaSSS, where you’ll find a rich collection of manga to explore. With 23 chapters translated into English and more on the horizon, there's never been a better time to start your adventure. Be the first to know—create an account today, bookmark Onee-San Is Invading!? and never miss an update!

Toono Ao failed to get into college and became a ronin, studying for next years exams instead. To better study for them, Ao moved out to live on his own into an apartment near his cram school. It's not much, but it's a place to call his own. But not long after moving in, a drunken lady finds her way into his new home! It doesn't matter how hard he tries, she just continues to make herself at home and take advantage of him. This is not okay! ...Or is it? His humble castle is no longer his own. Onee-san is invading!