(This is the first story I have written in a long time, so please be gentle!)
Garu was never one to show affection, especially people he considered mutuals, he just never grew to be as caring as his friends. But Pucca always found a way to make him feel uncomfortable, kisses, hugs, you name it! He honestly never liked Pucca, sure she was bearable sometimes, like when she is distracted by one of his clones. And when Abyo gave him that great idea to quite literally put a bell on her, (that may have caused some trauma but hey, you win some you lose some and good things don't last). The first person he remembers genuinely giving any type of affection to was his arch nemisis, Tobe... Tobe, wonder what he's up to?
or
Garu doesn't know how romance works besides what Pucca has "taught him" and what he's seen on TV. So he just y'know, improvises and researches, (AKA he just watches a ton of sappy movies and tries to somehow trick Ching and Abyo into giving him advise for getting together with "Pucca" cough cough TOBE cough cough).
Transmigrated into DxD World-Kuoh Town, Hibari Kyoya. an average student, spent 18 agonizing years in the world fully aware of the dangers, knowing he is utterly powerless in a world of gods and monsters, Until...
[Ding! Sign-In System loading... 20%... 50%... 80%... 100%.]
Destiny, it seems.. has a cruel sense of humor. A [Sign-In System], long overdue, finally bursts to life within him, offering a chance at survival, a chance at power...
[Ding! Congratulations! You have received the Rainbow-Grade Gift Bag!]
...
He then started completing System's tasks, accumulating even greater rewards.
[Ding! Task completed. Reward: Perfect Rumble-Rumble Fruit (Weakness to water Removed).]
[Ding! Task completed. Congratulations to the host for obtaining the Flying Thunder God Technique!]