「あの時、先生が届けてくれた言葉は──」
かつて大也が通っていた学童を訪問するブンブンジャーの面々。
そこで児童たちにギター演奏を披露する大也。
そんな大也を見た職員が、ふと彼の淡い初恋の話を始める。
初恋の相手はまひろ先生。
独りを好んだ大也少年にギターを教えたのも
まひろ先生だったと目を細める職員。
しかし彼女はもうそこにはおらず…。
大也の過去の話に花を咲かせている中、苦魔獣が来襲。
咄嗟に児童を守ろうとした大也と先斗が攻撃を受け、
昏い夢の中へと誘われてしまった。
懸命に起こそうとする玄蕃たちだったが、微動だにしない大也と先斗。
外界と遮断された夢の中。
大也の前に現れたのは、もう会えないはずのまひろ先生だった──。
"The words the teacher told me that time..." The Bunbungers visit the after-school care center Daiya once attended. There, Daiya performs a guitar performance for the children. A staff member who sees Daiya in action suddenly starts talking about his first love. His first love was teacher Mahiro. The staff member smiles as he remembers that it was Mahiro who taught Daiya, a boy who preferred solitude, how to play the guitar. But she is no longer there... As they are enjoying the story of Daiya's past, a beast attacks. Daiya and Sendo, who tried to protect the children at once, are attacked and are drawn into a dark dream. Genba and the others try their best to wake them up, but Daiya and Sendo remain motionless. In a dream cut off from the outside world, Daiya is confronted by teacher Mahiro, whom he was not supposed to see again.
