The Door of My Bathroom Leads to the Comic World!

"Th-that's because..." Utaha's face flushed red, and she was left speechless by Nino's sharp words.

Sui, watching this unfold, couldn't help but stifle a laugh. On one side was his senpai, a sharp-tongued, talented girl with a hidden dark side. On the other was a spoiled, arrogant rich girl who hated studying. Their personalities were completely opposite, so it was no wonder they clashed from the moment they met.

Just as Sui was inwardly amused, he felt a sudden pain in his foot. Glancing down, he saw a small, delicate foot clad in black stockings stomping on him—there was no doubt, it belonged to Utaha.

"Don't worry, sensei," Nino said nonchalantly, crossing her legs as she continued trimming her nails. "We won't tell our father you brought your boyfriend to class."

"Hey, you still haven't introduced yourself to us," Yotsuba chimed in with her usual lively energy, her gaze fixed on Sui.

"My name's Sui Mizushima. I'm a first-year student," Sui replied, smiling awkwardly.

"Huh?! A first-year?" Yotsuba's face lit up with a mischievous grin. "That makes us your senpais!" She puffed out her chest proudly, adopting a senpai's tone. "Come on, call me senpai already!"

Sui looked at her, slightly exasperated. Though they were technically a grade above him, they were likely the same age—sixteen.

"Wait a minute, doesn't that mean you're two years younger than sensei?" Ichika suddenly raised her head from Yotsuba's lap, her interest piqued. "Isn't this a classic older woman–younger man relationship? So, how did you two meet? Did you chase after sensei, or did Kasumigaoka-sensei go after you?"

The other sisters instantly perked up, clearly curious about the answer.

"Also," Ichika continued, her playful eyes narrowing. "Are you two already living together? How else would you know about her leaving panties and stockings lying around?"

Lying lazily on Yotsuba's thighs, Ichika wiggled her feet, showing off her graceful curves as she playfully stirred the conversation.

"Wow, I didn't expect this. On the surface, she acts all prim and proper, but secretly, she's shacking up with a junior two years younger. What a hypocrite," Nino smirked, her words dripping with sarcasm.

Utaha clenched her fists, her irritation almost palpable as she stomped the floor repeatedly.

"Ahem, well, about my relationship with my senpai..." Sui cleared his throat, trying to explain, but Ichika interrupted, her voice turning teasing and suggestive. "Oh come on, you're already living together, right? You must've had 'that' kind of relationship by now. How does it feel? Does it feel good?"

"Ichika! How can you say something like that?" Itsuki's face turned beet red, her shyness showing as she shrieked in embarrassment.

The other sisters blushed as well, even Miku, who usually kept her emotions in check.

"I really can't wait to experience love," Ichika giggled, sticking out her tongue. "So, Sui-kun, tell us more, won't you?"

"How can you even bring up something like that?" Itsuki's face was still bright red, but her eyes betrayed her curiosity, sneaking glances at Sui. 

The other sisters were the same, casting secret looks his way, clearly eager to hear more.

Sui felt utterly speechless. These five sisters were proving to be quite the handful.

Even though Utaha remained silent, a faint blush crept onto her face, and she stepped harder on Sui's foot, clearly expressing her disapproval.

"It's really better if we don't talk about this, alright?" Sui coughed awkwardly.

But Nino wasn't done. Her eyes gleamed with mischief as she asked, "Fine, then tell us, aside from her habit of leaving panties and stockings everywhere, what other embarrassing secrets does Kasumigaoka-sensei have?"

"Oh, there's plenty," Sui grinned mischievously. "For starters, when she's writing novels, she sometimes falls into these neurotic states."

"Really?! What else?" the girls asked eagerly, hanging on his every word.

"And don't let her cool, composed appearance fool you—she's actually really lazy. She even makes me wash the dishes. Heck, she once made me wash her underwear~"

"Seriously?" the sisters burst into laughter, even Miku cracked a rare smile.

"You two must get along pretty well, huh, 'Kouhai-kun'?" a voice chimed in, calm but filled with underlying menace. Utaha was smiling, but it was a cold, eerie smile that sent shivers down Sui's spine.

His heart skipped a beat, and he immediately fell silent, realizing he'd pushed her too far.

An angry senpai was truly terrifying!

"How about this," Utaha said after taking a deep breath, her tone suddenly calm. "If you can pass my test, I won't have to tutor you anymore. Sounds good?"

"A test?" Ichika yawned, rubbing her eyes.

"sensei, are you underestimating us?" Itsuki, who had two star-shaped hairpins in her hair, puffed out her cheeks, clearly annoyed.

"If that's how you want to take it, then so be it." Utaha crossed her legs and smiled faintly, her black stockings catching the light.

"Damn it! Don't think you can look down on us just because you have good grades!" Itsuki, determined, gritted her teeth and pulled out a pair of glasses, ready for battle.

"This is so troublesome..." Nino sighed as she lazily removed one of her white-stockinged feet from the other.

Finally, the five sisters begrudgingly sat down and began working on the test papers Utaha had prepared.

"Hey, senpai," Sui leaned over and whispered, "what happens if they actually pass? Won't you lose this tutoring gig? Royalties alone won't cover the expensive tuition, living expenses, and rent, right?"

Utaha smirked confidently. "Don't worry. These girls aren't as sharp as you think."

The test results came in soon after.

"Wow, this is impressive," Sui remarked as he looked at the score sheet. "A perfect 100."

The five sisters sitting across from him blushed deeply, their embarrassment clear.

Because that 100 was the sum of all their scores combined.

"We're all idiots," Ichika chuckled awkwardly. "When you split the brainpower of five sisters, this is what you get."