Transmigrate inside a Web Novel as a Side Character.

Leon, who stood absentmindedly seeing the two of them share a passionate kiss with each other, felt his heart crack with an intense grief accumulated in his heart. He saw Mary, a girl who caught his attention recently, embrace another man with an alluring moan and breath she leaked every time they kissed.

Gradually, the crack in his heart grew larger until it filled his entire heart, making it so fragile toward another touch. Leon couldn't see the scene any longer for fear that his heart would be shattered completely.

Leon cast his gaze down, not daring to lift it again and try to turn his body, then dash away from the place. However, the moment he wanted to make a stir with his hasty judgment, a strong grip stopped his attempt, making him turn his gaze toward Hina, who is in a completely different state from Leon.

Hina's eyes were shrunken in a dangerous state as she, with her mana manipulation that reached an intermediate level, could clearly see what the two of them were doing was something terrifying, for it involved one life.

"Unhand me this instant!".

Leon, within this state, let his rough tone in a whisper so as not to make their cover obvious. His act made Hina knit her brows in annoyance.

"Shut up. You don't know anything and yet are acting foolish like that. Face the reality in front of you, damn it!".

"Foolish, what the hell are…".

"I said shut up?! It's almost time!".

"?!".

Hina turned her head toward the kissing scene as she released the hand that was holding Leon's right wrist and focused her attention on the scene.

On the other side of the scene, the male senior with such vigor earlier began to dim as his body started to convulse in Mary's embrace. Mary, who saw the male in that state, brought his lip closer, tightening her embrace around the man's neck for the last time.

Mary's eyes, which shone in green pupils, turned into a charming purple color, followed by her hair. Gradually, she released the man in her embrace, who had lost strength in his limbs, lying on the ground unmoving. The senior male was in a bad state with his eyes that rolled to the back, his skin that white as a sheet of paper, and his complexion was shrinking as if his soul had been sucked.

"This is how far I can get from a virgin nerd like him, fuu. I need someone with a strong physique that will give me more energy to harvest".

With her new appearance, she traced her plump lips as she cast her fluttering sigh. Mary, after sucking the life force from the male in front of her, temporarily releases her true form. Her usual form was a beautiful human girl with green hair and an adult charm.

Now she turned into an adult woman in her early twenties with violet hair that blended with the surrounding dark, and from her back, she accidentally released a pair of bat wings that stretched outside, feeling joy for being freed after long of being sealed.

"Hm?! Who's there?".

Mary, with her true form released, feels another presence beside her in this dark place. She knitted her brows, then turned her gaze to the source and found a pair of male and female with familiar faces. One of them is a tall, handsome boy with short blonde hair who seems surprised seeing her change in the atmosphere and appearance.

The other is a beautiful, short red-haired girl with a glare that could kill people directed at her.

Mary was both annoyed and curious at the same time, knowing that her undercover had been blown up. Also the matter regarding her mission, she spread her lips to show her nasty sharp canines toward the first-year students who she deemed as dangerous for holding her secret.

"Junior Leon and you girl, it's a shame, but you must die here, girl".

She clenched both her hands before a magic circle with a diameter of two meters appeared with its symbols as the surrounding mana began to undulate around it, being sucked toward the circles.

Hina saw the demon girl preparing her magic before her. She focused her attention on gathering mana on her right palm before she thrust it upward. From her palm, a flickering spark began to dance across the dark artificial forest. The spark started to turn brighter and created a mass of fireball that she threw to the sky.

A ball of flames began to carve its way, burning any wind that blocked its attempt to reach the sky, and after it reached a high altitude, Hina clenched her hands and let the ball of flames explode, creating havoc with fireworks that would alarm the other person.

"Too Late".

However, as the ball of flames exploded and let out its brilliance spark across the air, a thin membrane of mana began to surround the four of them in the dark forest, creating a cage that entrapped and prevented anything from getting involved with the situation on their side.

"Tch..".

Hina, who realized what Mary had been doing, knitted her brows as she began to summon her legendary equipment in her left hand. She prepared her stance and then opened her mouth.

"Senior, can I assume you are a demon, yes?".

Mary, who heard Hina's question, is standing still, unmoving, while also casting her frosty gaze at her. Hina, who felt the gaze, felt her body shudder because of the oppressive might Mary had unknowingly unleashed.

"It doesn't matter, right? You already saw everything, but I will make sure that this will be the last day you will breathe".

"...So, I take that as a yes. I see, so you are a demon".

Hina, unusually calm, inhaled a deep breath to calm her raging heart upon the mentioned demon. She began to recall Soma's weird behavior. "Soma, so you already knew all along that Woman is a demon, and he is deliberately hiding it from us so that it doesn't concern us". She exhaled the breath she was holding, "Fuu, it seems I still have a long way to go to stand beside him. However…".

In front of her, there is a demon folk who has caused great misery and suffering for Soma since he was little. Without her knowing, her pupils dilated into a dot as the fiery aura around her turned into a menacing aura. Her furious glare even made Mary, as a demon, shudder in shock.

"Why is that girl having so much hatred?". Mary is wondering why Hina holds that much resentment in her eyes while also preparing her other magic.

With renewed resolve in her heart, Hina drew the blade and pointed it at Mary. Hina realized the gap of strength in their power and the experience they had as an abilities user. But she believes that the flames she detonated earlier will be noticed by many people in the academy, especially by Soma.

So the thing she needs to do is to hold on until help is coming and, for the first time in her life, face the demon, one of her loved one's mortal enemies.

"...Your evil will stop here, demon".