With the new SRS style on JPClass, 1-star items will go to Oblivion after 1 day. 2-star items will go to Oblivion after 3(?) days. I don't know any more after 2-star because I haven't used it enough to get my star levels up.
Simply reach level 2 (by earning 4000 EXP to fill up your EXP bar for levelling up). All romaji on the site disappears once you've reached level 2.
google street view https://ggstreetview.com