第1章 ‘妹妹’这种生物 

The creature 'sister'

Because of an accident, Tang Zijun traveled to a parallel world.

Traveling with him was an unknown Kamen Rider Belt.

After realizing that there was a strange inner world called the Mirror Plane hidden beneath this world, Tang Zijun spent several years alone to successfully eliminate all the monsters in the Mirror Plane.

At the same time, he is gradually adapting to his new identity.

Just when he was living the peaceful life he wished for, Tang Zijun accidentally discovered his sister's secret - she was actually a magical girl!

Could it be that there is a faction in this world that even he doesn't know about?

Are there more evil monsters than just one in the Mirror Plane?

Was I going to have to watch my sister live the same dangerous life I had before?

Regarding this...

因为一次意外，唐子君穿越到了平行世界。
  和他一同穿越而来的，还有一个未知的假面骑士腰带。
  在察觉到这个世界之下隐藏着镜位面这种诡异的里世界后，唐子君孤身一人，花费了数年的时间成功剿灭了镜位面的所有怪人。
  同时，他也在逐渐的适应着自己的这个新身份。
  就在他过上了如愿以偿的和平生活的时候，唐子君却无意间发现了妹妹的秘密——她居然是个魔法少女！
  难道这个世界还有着连他都不知道的阵营？
  难道邪恶的怪人不止镜位面一个？
  难道自己要眼睁睁的看着妹妹过上自己之前危机四伏的日子？
  对此...