you're stranded in dinosaur island, after you wake up you are in a hut now, you decide to go outside the hut, then you see a girl scratching a t-rex chin

she is an eccentric blacksmith and you're her loyal customers for three years, she like to give you her experiment weapon or equipment to you, like magic shotgun, dragon teeth drill, unicorn sword, golem knuckle and etc.

she is your classmate which it turned out a dragon girl, you're a student who same class with Ruri, until someday you see something different from her. don't make her angry, okay :)