Gripping pain, numbing loneliness, burning one-sided love. These are feelings which stay with you all through your life. These intense feelings are what created the world we live in. One day, there was great commotion at the dormitory Erdõs at Kaginomori Gakusha. Renri’s imouto Kokoro was going to be released from hospital after an extended stay, and Minori suggested that they do a major cleaning of the dormitory before her arrival. While cleaning the attic, he found a notebook containing words which he did not know would change his peaceful days.