Game is White Cat Project, region locked to Japan. Somehow I was EXTREMELY lucky to pull Chisato and Takina with only 350 jewels (One 10x pull and 5 singles) My brother was not so lucky and rerolled 4 times with no avail. It's a game only available in Japan so you can't buy jewels if your free ones fail you.
I don't know how to find the t-rex in the grass area. Only this annoying high level one in this equally annoying time limit stage. Somehow level 100 Chisato can not only endure being digested for longer periods of time, she can also one shot it. So I have to very carefully kill the other enemies without hitting the T-rex. I really like Chisato so I got carried away with mulitple shots... Well she was also the one who can take more than one hit... The other girls will die right away... you can see at the end when I tried to let Takina get eaten but she is digested almost immediately. If the dinosaur charges at her she will die right away. So frustrating. She is only level 50 while Chisato is level 100 but it shouldn't make THAT much of a difference. The power scaling in this game is ridiculous. The other girls are level 100 but they will die faster than Takina. Chisato is just cracked, super fast, kills everything in sight and can take a decent amount of hits. Still I need to find where the other t-rex is to enjoy the scene more.