Have you watched those cliches from accidental walk-in on girl changing clothes to nip slips, onsen scenes covered by unknown fog/light and every other scenes that end with a shriek "Kyaaa! Pervert" and the MC gets a red handprint on his cheek. What if there were no shrieks, slaps or embarrassed tsunderes, Ping Pong Club is what you'll get. This is Pure Ecchi and what real Ecchi looks like. Series like High school DxD and etc. force Fanservice scenes & categorise them as Ecchi. In this series Ecchi scenes come naturally. Nudity and Sex scenes are throughout the series but not once has it been taken seriously(Rom-genreserious), for that reason alone it's way different than H+ and Fanservices. Take the old hag for instance...Seriously who makes gags like that; still gives me the giggles.

Watch it. It contains all the cliches and what-you-wanted outcomes