日本の コンビニは、二十四時間 開いて いる 店が 多いです。
食べ物や 飲み物の ほかに、たくさんの 品物を 売って います。
電気や 水道の 代金も はらえます。
コンビニは 町の 生活を ささえて います。
Why six school grades, and not N5–N1?
Because that is how Japanese children learn to read. Japan's Ministry of Education fixes exactly which character belongs to which grade — so "grade 3" is a boundary you can verify, not a feeling. Every article here is machine-checked: if a single character sits above its grade, it is not published.
The result: you never hit a character you have not learned. That is the whole reason this product exists.