“大いなる門と鍵の神の御名に於いて
　力を与えよ。力を与えよ。力を与えよ。”

本来は夢の国の賢者の名を冠した半月形の刀。
その製法は死霊秘法として知られる魔道書断章に
まで遡る。様々な儀式に用いる祭具。
取り扱いには厳重な注意を要するこのアイテムを、
携行にも便利な夏の行楽向けにアレンジしてみたのが
このバルーンの偃月刀である。
使用の際は術者自身が息吹を注ぎ膨らませること。
その間は何者も手を貸してはならない。

「ここに夏を喚びましょう？
　繰り返し寄せる波の音。秘めやかなる日蔭で。
　ほんの束の間の、忘れ難い二人きりの夏を……」

"In the name of the god of great gate and key, give me power. Give me power. Give me power."

Originally a half-moon shaped sword named after a sage from the land of dreams, its construction method can be traced back to the literary fragments of a grimoire known as the "Necronomicon." It's a tool used for various rituals, and it normally requires extreme care when handled. Yet it's been arranged in a way that it could be conveniently carried for summer excursions...it has turned into an inflatable scimitar.
To use it, the wielder needs to personally fill it with their own breath to inflate it. During this process, nobody else may give them a hand.

"Shall we call forth summer here? The sound of the waves swelling...under the privacy of the shade. For a brief moment, may an unforgettable summer between just the two of us arrive..."