Warning: filesize(): stat failed for /home/j-keiei/www/wp/wp-content/uploads/wpo/images/wpo_logo_small.png.webp.lossless.webp in /home/j-keiei/www/wp/wp-content/plugins/wp-optimize/vendor/rosell-dk/webp-convert/src/Convert/Converters/AbstractConverter.php on line 217 教育関連業者の倒産 今年は過去最多のペースで推移 | 学習塾経営研究会