Ayakashi Futago no Oishasan 4 Yoto to Kodoku na Jutsusha (Fujimi L Bunko) [Light Novel]

[Machine Translation] The twins, Haru and Arashi, are doctors of ayakashi, and Riri is their apprentice. While working with the twins to heal wounded ayakashi, she comes to know the personalities of the twins, who cannot leave the weak alone. In the spring of her senior year, Lily meets Kanemitsu, a mourning god with a demon sword, while helping at an antique exhibition. He is a sword that has been sealed away by an owner who wished to help others but did not wish to kill. Kanemitsu wishes that Riri, who can see ghosts, will make use of him. But then, an unknown sorcerer suddenly appears and attacks Kanemitsu. He declares that all ayakashi are harmful beings that must be extinguished.

あやかしのお医者さんである双子・晴と嵐と、弟子の莉莉。彼女は双子とともに傷ついたあやかしを癒しながら、弱い者を放っておけない二人の人柄を知っていった。進級する春、莉莉は古物展示会の手伝いで妖刀の付喪神・兼光と出会う。彼は人の役に立ちたいと願いながらも、昔、殺生を望まぬ持ち主に封印されていた刀だった。兼光はあやかしがみえる莉莉に、自分を役立てて欲しいと願う。しかしそのとき、突然見知らぬ術者が現れて兼光を攻撃する。あやかしは全て消えるべき有害な存在だと断定する術者に、莉莉は―?