Below the "Senjuin Tomb", inside the Qiandagu tunnel.

"So, on the sidewalk of the Thousand Valley Tunnel, there is a door frame that only you can see, and it is also a dark tunnel inside?"

At this moment, Yumako Tori and Sosuke Araki are squatting on the side of the road, communicating with Mai Hanyu of the "temporary headquarters" in the van.

"Yes, I have tried to walk around the door frame, and the symbols in the picture scroll have been turning around, pointing to the inside."

After repeated confirmation, the reason why Sosuke Araki suddenly disappeared and appeared was the dilapidated door frame that only he could "see" standing alone in the middle of the sidewalk.

"I think what Araki-sensei saw should not simply be called a 'door frame', but a 'torii gate', and behind it should be a mysterious hidden place."

After thinking about it, Kotori Yumayumi thinks that there is only one possibility.

Torii, in the inheritance of Shintoism, is known as "one step in the realm of the gods, one step in the world".

Like torii gates, things like portals, tunnels, and passages also contain the symbolic meaning of "leading to another world".

"How does the hidden energy field act on an object to produce this phenomenon of space separation? Oh hehe, it seems that there is a new research topic..."

Seemingly curious about this phenomenon, Hanyu Mai on the other end of the communication had a tone that she wished she could come over in person.

"Unfortunately, there seems to be no video 'live broadcast' there, and the remote communication can barely be maintained."

"Then, what's next?"

"What else can I do, of course, follow the guidance of the 'arrow' and smash into the deepest part simply and rudely!"

"Okay, then let's go and see what is hidden behind this broken door..."

The figure of Sousuke Araki disappeared again in the center of the tunnel.

However, the witch who followed behind him took a few steps back and forth where he disappeared, but still could not get in.

"Huh? Even if I go to the right place, am I the only one who can get in?"

Appearing half body again, looking at the witch behind him, Sousuke Araki scratched his head helplessly.

"It should be that my cultivation is not enough to break through this 'enchantment'..."

Tori Yumayumi looked at him with peaceful eyes, but her cheeks bulged out of discouragement.

Not only the items indicated by the picture scrolls, but also the secrets of the Sendagaya Tunnel must be hidden in this mysterious barrier.

If it was so easy to decipher, the Tokyo Metropolitan Soul Removal World would not have been troubled by this strange tunnel that has been haunting it for decades.

"If only sleepers can enter, it must be a problem with the frequency of the body's magnetic field! If it is in the 'connected' state..."

At the same time, Hanyu Mai's frantic instruction came from the channel: "Sleeper, you take Yuu-shi's hand and walk in together to try."

"Hold, hold hands?"

"According to Toyama Park's Spirit Removal Action and the analysis of previous experimental data, the magnetic field of people who are in contact with your body will also be at the same frequency for a short time, which can not only dissolve the erosion of the hidden energy field, but should also be able to enter some places that were otherwise inaccessible. "

"I see……"

Listening to Mai Hanyu's description, in Toyama Park last night, the scene of the two standing hand in hand on the eerie stairs where they were worshipping when they were ugly came to Yuma Yumori's mind again.

"But, but..."

Last night on Mt. Hakone, holding Yuma Yuma's hand was just a conditioned reflex in desperation.

At this moment, holding hands under the "matching" of Hanyu Mai, Sosuke Araki always feels a little guilty.

"Why, don't hold hands, do you want to go in in any other position?"

Just when Sousuke Araki wanted to say something, the girl's soft weed, who was like water, had already held his hand softly and firmly.

"Then please, Mr. Araki..."

Beside him, Yuma Yumiya's eyelashes drooped slightly, and a blush appeared on his face.

"Stay still, what are you doing, let's go."

"Oh……"

Feeling the soft, boneless and smooth little hands in his hands, Sousuke Araki turned around with sweat on his head and his whole body stiff, and disappeared in the middle of the empty tunnel with the girl's figure.

...

"Survey Corps... This is the Wall of Maria... Shasha... Can you hear... Zizi... What's going on with you?"

In the earphone, there was an intermittent questioning voice from Hanyu Mai.

"Ha... Maria's Wall... Occasionally there is electromagnetic interference... But communication is still possible..."

Sousuke Araki listened carefully to the voice in the earphones, and communicated with Mai Hanyu about the current situation.

"We're in a tunnel for now, but it's a little different..."

Passing through the strange door frame, the two were still inside the Qiandagu tunnel.

"If you insist on explaining it, it's like the relationship between the watch and the **, this should be called the 'Ri-Sentagu Tunnel'."

But this two-door four-lane tunnel with the same structure has completely changed at this moment.

Without the dim lights and occasional passing vehicles, there is a cold and muddy smell inside the quiet and dark tunnel.

Whether looking forward or backward, there is only a dark tunnel that is endless and despairing.

From the top of the tunnel to the inner walls on both sides, it is all composed of dark red flesh that is generally uneven and squirming like human internal organs.

"Tick, tick..."

Occasionally, there are dark red viscous drops of blood dripping from the top of the tunnel.

"So, that should be the 'water' that has been leaking from the top of the tunnel."

Looking at the "blood drop" that dripped into his palm and turned into resentment, Sosuke Araki, who stretched out his hand, showed a wry smile.

"Teacher Araki, look... the engraving on this door seems to be a family crest."

Yumayuki, the little bird who was standing behind him, who had been silent for a while, suddenly exclaimed.

After being led by Sosuke Araki into the invisible door frame and into this dark tunnel, she turned around and curiously studied the dilapidated "door frame" behind her.

This door seems to be the original door frame tied with some kind of tree branches~lightnovelpub.net~, which is engraved with densely packed strange symbols.

But at the very center of the top of the door frame was a familiar emblem with a clover in a circle.

"I remembered, this is the family crest of the "Kiichi Tokugawa family"! "

Tori Yumayumi suddenly reacted.

Because of what happened last night, after she went back, she took the time to make up for some historical materials about the Tokugawa family. This family crest was found in the materials.

"Huh? The Kiichi Tokugawa family...isn't that one of the 'Usan families' you mentioned earlier?"

Now when I hear words such as "Tokugawa family" and "Yusan family", Sosuke Araki feels a headache.

The "Owari Tokugawa family" dared to secretly do some kind of maddening things in their own manor, such as living sacrifices, visiting shrines when they were ugly, and enshrining the corpse of Mayuji...

It is estimated that this "Kiide Tokugawa family", who is of the same spirit, will not be a good class.