History's Strongest Disciple Kenichi is probably the most popular ecchi series, and one of the longest for sure. This manga features a really interesting mix of ecchi and martial arts. The way the characters are presented and how their relationships improve and the story progresses, keeps the readers very interested. Another interesting aspect about it is that the author never changes the manga's style, or takes off any of its original elements to raise popularity. He remained loyal to what he proposed to do originally with the series. Whether that's the secret behind its popularity and why this manga has been around for so long, I don't know. But you definitely should check it out!
Name: History's Strongest Disciple Kenichi
Current Progress: Chapter 537
Read Online: Read Online Here
MangaStream is a group focused on popular manga series, and even though they release very diligently they don't follow a pattern when it comes to releases. It's even harder to comment about past chapters of the projects they decide to do, if you would like to read it from chapter 1 (that would take a really long time) you should look for the chapters somewhere else and not at their native reader. They are probably keeping the most recent chapters they translated themselves.