One Piece – Thundergod Marine - Chapter 31 Engage

This is the story of a young man who was reincarnated as a dragon with a near-insatiable curiosity. Initially sparked by questioning his own reincarnation, he quickly gets lost in the endless world of magic, using his deep understanding of advanced sciences to learn the laws and properties of a new type of energy known as mana.However, soon enough, the table would flip, and he would begin using that very same energy to expand his knowledge of science, to the point that he would begin questioning his own understanding of the world.Although not his original intention, with the combination of his intelligence, expanding curiosity, and the 'miracles' that occurred to allow for his existence, he quickly found himself climbing the mountain of strength as if it were a small hill before eventually climbing to a point where it seemed as if he himself was the peak itself.Even if.. that was never the case...There is mild gore, and profanity is 'censored' toward the beginning, but not later in the story.

Eren Idril died as an old, decrepit, and piss-poor adventurer by the maws of a D-Rank monster. He had a lot of unfulfilled dreams and desires that couldn't see the light of the day after the light in his own eyes died down.

But fortunately for him and unfortunately for the world, that wasn't his end. Eren was somehow dived back in time when he was a mere teen, attending Lionheart Academy for adventurers.

When life gives him a second chance, Eren decides to exploit it to its fullest. Experience his vile deeds as he partakes in them without feeling the slightest bit of hesitation.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

One sentence introduction: Do you love him? Even though he has a human-like face, he has the heart of a beast.

Mermaid Attack × Breeder Shou

One month after Boyce entered the Eureka Marine Research Center, the institute caught a blue male mermaid S-37.

A year later, Boyce became the breeder of this mermaid. After getting along for a while, Boyce found that the fierce and cruel mermaid in front of others was completely different when facing him…

————

Someone asked: “Do you believe that mermaids have the emotion of love?”

Boyce said, “I believe it.”

S-37 asked: “What is liking?”

“I like it…you have minions that are enough to tear me apart, but you can retract your claws when you touch them.”

“what is love?”

“I showed my neck in front of you…”

……

The young experimenter was dragged into the pool by the mermaid. The mermaid restrained its minions, carefully circled the human with its tail, and whispered “I love you too” in his ear.

Ending Cookies: The Daily Life of Dragon Cubs

Content tags: strong fantasy space special liking karmic encounter

Search keyword: Protagonist: Boyce ┃ Supporting role: ┃ Others: Mermaid

One sentence introduction: Mermaid attack & breeder suffer

Purpose: to protect marine life, and to live in harmony with nature

- Description from novelbuddy