Wailehea, 11 years old, member No. 4 Of the Phantom Troupe, is on a wonderful trip to another world~
She was in her prime years of youth and beauty, but was transported to a strange world by a strange whirlpool. She was seriously injured and covered with various debuffs, and fell in front of the boy in her destiny - Seiichi Yukimura.
"A sacred oath is an oath that must be established and must be observed. It must not be violated." The round golden light lit up in the girl's eyes. "You should have this awareness."
"... Yes, I know, this is what I need," Seiichi Yukimura replied gently but firmly with a smile on his lips.
"The effect of your exercise is not very obvious. Do you want me to teach you a few tricks?" Vileheya said jokingly, looking at the young man training.
"Thanks, Hea, but I probably won't be able to use that kind of killing technique." Seiichi Yukimura smiled helplessly, "Tennis is not that dangerous."
"It's not as easy as you think to reach my level of tennis," Yukimura Seiichi said with stern eyes, "If you just rely on your skills to show off your strength, then it's no surprise that your tennis level is stuck at a bottleneck."
"... I know, I will try to face up to the sport of tennis. I think that if so many of you are working hard for it, tennis should also have some meaning."
Cp: Son of God×Cat-type martial girl
Two-way taming of evil cats
Small theater (the text may not happen):
"After you sign the contract, you are my servant. Don't even think about disobeying my orders."
"Do you still want to eat today's meal? I made a small cake. If you don't eat it, I will eat it all."
"... Okay, you despicable guy, for the sake of the little cake... Hey, don't eat them all, leave some for me!"
Concept: An unexpected encounter may be a reunion after a long absence. Every unexpected encounter is a gift given by fate.