In Demon Slayer With Heavenly Insight

Chapter 39: A Peek into the Diary -,Again!

Before starting, Ren hesitated for a moment.

Isn't it wrong to open a girl's diary like this? It's her personal privacy...

But then, the memory of the last incident surfaced in his mind.

What if something similar happens again?

Ren took a deep breath and rationalized his actions.

"My hand slipped!" he muttered dramatically.

With a loud snap, the diary fell to the ground.

"Oh no! How clumsy of me!" he exclaimed, bending down to pick it up.

Feigning innocence, Ren hurriedly closed the diary page by page, pretending to be careful. But his fingers stopped when he reached a familiar section, the one he'd glanced at last time.

---

Tuesday, Weather: Foggy

"Sister, do you remember the mission I mentioned a few days ago? I made a mistake and got stabbed in the arm by a human."

"There were so many powerful demons around that my heart sank to the bottom. I didn't know how to escape."

"This is my fourth day on Mount Natagumo. At that time, the team was reaching its limit. Maybe I'll see you soon, Sister..."

---

Wednesday, Weather: Cloudy

"Sister, I made it back. Tonight, I discovered traces of three Lower Moons on the mountain. They were all killed by the same person."

"I found out it was Ren. I'm so grateful to him. Without him, I probably wouldn't be here today."

"Ren was injured, and I was so anxious. It was almost dawn by the time I rushed back to the Butterfly Mansion."

"Sister, you won't believe this—Ren was sitting on the threshold, waiting for me. I don't even know how long he'd been there."

"The moment he saw my wound, he calmly bandaged it and applied medicine. I've never seen anyone as gentle as him, except for you, Sister."

"Everyone calls him Mr. Ren, but he acts like a stinky little brother pretending to be all grown up."

"Sister... do you think Ren likes me? Why is he so kind to me?"

"Sister, I almost fell for him. But I'm a moth drawn to the flame. I have my goals, my plans. I can't be with Ren."

"I know that Kocho Shinobu can like someone, but the Insect Hashira cannot."

---

Thursday, Weather: Sunny

"Sister, after Ren and I returned from the mission, I heard Aoi shout, 'Ren fainted!'"

"I'm a doctor, but I froze in that moment. Sister, do you think Ren collapsed because of me?"

"I sat by his bed all day, wiping his sweat and changing his clothes. He looked so peaceful in his sleep, his profile so gentle... I didn't realize how long I'd been sitting there."

"He's about to wake up, but I can't let him see me. This relationship can't go any further. There's too much I have to carry."

---

Friday, Weather: Cloudy

"Sister, Ren went to the training ground today. I asked Rengoku-san to teach him some techniques, so he wouldn't get hurt again."

"Also, I ran into the Wind Hashira, Sanemi. He was talking about awakening marks like Ren. I wasn't going to interfere, but then I overheard him badmouthing Ren!"

"I couldn't hold back. I scolded him right there! If it weren't for the fact that he once admired you, Sister, I would've hit him with Butterfly Dance!"

"But I need to smile, right? You always said Shinobu-chan must smile like a lady."

---

Saturday, Weather: Rainy

"Sister, I went on a mission today and heard that the demons are looking for Mr. Ren. I also found out that Ren avoided showing his face to the demons that day."

"I didn't report this to the Master because I knew Ren had his reasons. It's raining heavily now, and I feel so cold."

"Sister, I miss you so much. Your sister really misses you."

---

Ren turned to the last entry, the writing abruptly stopping at the word "miss."

As he read between the lines, the complexity of Shinobu's emotions became clear.

Beneath the mask of the Insect Hashira lay the vulnerable thoughts of an eighteen-year-old girl.

Ren sighed softly. "I didn't realize she carried so much..."

He recalled her determination to kill Doma and the extent she went to prepare for it. Injecting herself with wisteria poison daily, her body had essentially become a weapon.

"Seventy times the lethal dose," Ren murmured, his fingers gripping the diary tightly.

Every drop of her blood was laced with enough poison to kill any demon except the Demon King and the Upper Moons.

That's why I always smell wisteria on her...

Ren's expression hardened.

No. Now that I'm here, I won't let her sacrifice herself.

He glanced at the diary again, his eyes lingering on the line: "Sister, I almost fell in love."

For a brief moment, a smile tugged at the corner of his lips.

But his thoughts were interrupted by footsteps approaching the basement door.

Someone's coming!

**