Sanae, doing her usual shrine chores, was folding clothes when she suddenly felt her breasts being assaulted.
"Eh, eh!? What's going on!" Sanae panicked at the sudden attack on her breasts, as she looked down and saw an invisible pair of hands reaching into her clothes, wantonly playing with her full breasts.
This immediately startled Sanae. At first, she thought it might be a ghost or something, but she quickly dismissed that thought. After all, the Moriya Shrine had deities. How could any ghost dare to sneak in? Furthermore, she wasn't an ordinary person, so how could she not see a ghost?
"And this feeling… is it… Kars?" Sanae was very familiar with this way of fondling her breasts. After all, only Kars would do this to her. Her initial panic subsided, replaced by shyness and helplessness. She realized this was a new game Kars had come up with.
"Seriously… don't scare me like this… Are you even listening to me, Kars!" Sanae looked around, but couldn't see Kars anywhere, which only confused her further.
"Kars, she doesn't seem scared or nervous at all." Koishi, standing behind Sanae, observed Sanae's progression from initial nervousness to current shyness and enjoyment after Kars's assault, and spoke up.
"She's too familiar with me, after all." Kars was not surprised by this. Since they were familiar with each other, some actions easily gave away his identity. He had originally intended to use this ability to be unnoticed to play perverted tricks and see the reactions of other women, but… it was a failure.
Soon, Kars became noticeable to Sanae again. After they had a good round of sex, Kars left the room with Koishi.
"In that case, Kars, do you want to come home with me? You can play with Utsuho and Rin! They definitely won't react like that!"
"Who are those people you mentioned?"
"They are my older sister Satori's pets! They often keep me company, but they still forget about me. And I also want to take Kars to meet my sister and let her know that I have Kars accompanying me now!" Hearing Koishi say this, Kars was somewhat tempted. He nodded in agreement, preparing to visit Koishi's home, the Palace of the Earth Spirits. After informing Kanako and the others, he set off with Koishi.
"So, it's underground." Kars looked at the deep pit leading underground before him. He never expected there to be youkai beneath Gensokyo. Then, he followed Koishi down. Koishi explained that this area was the former site of Hell, which was later abandoned. Her sister then came here and took over the job of managing the vengeful spirits underground. There was also a group of Oni living here.
After traversing the dark passages, Kars saw the scenery of the former Hell and the dwellings of the Oni established there. However, their main destination was not these, so Kars didn't stop, continuing with Koishi until they arrived at the Palace of the Earth Spirits.
Upon entering, because of Koishi's ability, the pets helping Satori manage the place didn't notice the two of them at all. They easily reached Satori Komeiji's room. Kars saw Satori, who had short pink hair and a third eye of a similar but different color than Koishi's.
Looking at Satori's similarly cute appearance and figure to Koishi, Kars felt a little excited about what was to come. However, as he approached, he saw Satori, who was working, suddenly look up. Both her eyes and her third eye were staring right at him.
This situation stunned Kars, and he wondered why she had noticed him. Had Koishi's ability failed?
"Are you surprised that I noticed you? Koishi-chan's ability hasn't failed, but I can read your mind, so I was able to find you."
"So it can be like this!" Kars suddenly understood. In that case, I can't do those perverted pranks at all! Kars's expression immediately fell. He had really wanted to see Satori Komeiji's reaction.
"You were planning to do that kind of thing!" Satori, having read Kars's thoughts, flushed crimson. She never expected that he came here planning to use Koishi's ability to play some lewd tricks on her.
"You better explain yourself clearly!" Kars looked at Satori, who completely knew his thoughts, and suddenly felt that facing someone like her was a bad idea.
After Satori learned the entire story and saw that her most cherished younger sister had not only had sex with someone but also brought him back to play those lewd tricks on her, her expression turned very unpleasant. Although she knew that Koishi, in her current state, would have different thoughts than a normal person, pulling her out without hesitation to allow someone she barely knew to play those lewd pranks on her still left her with a heavy heart.
"I have fully understood your actions. Normally, what you have done is absolutely heinous. However, you have also shown me the possibility of Koishi-chan reopening her mind. For now, I will let you go, but in return, you must help Koishi-chan open her closed mind."
"Does that mean having sex with Koishi all the time? I understand! I will keep doing this without you even having to tell me!" Although Kars sounded cooperative, Satori truly wanted to hit him.