Oricon (Japanese research organization) released its weekly Light Novel ranking for the week of May 19 2025.
※The English titles of works may not always be accurate as some have not been released overseas. Thank you for your understanding.

Related rankings are compiled here
Oricon Comic Ranking Summary

5th place: The Tough-Faced Firefighter Who Came to Pick Me Up Overflows with Love for Me and My Twins

“You and the twins are just too cute.” — Caught in the love of a hyper-rescue firefighter!?

Momoka works at a pastry shop. One day, a tough-looking man walks in—he turns out to be Tougo, the firefighter who once saved her during an accident. Their emotional reunion soon leads to a passionate relationship. As she is enveloped in the love of the strong and devoted Tougo, a woman claiming to be his fiancée appears. Momoka is threatened that if they don’t break up, he’ll be forced to quit the fire department. She decides to step away—but soon discovers she’s pregnant.
As she begins raising the children alone, Tougo suddenly reappears!
“Nothing matters more than you and the twins.”
To make up for the time they were apart, he showers her with sweet and passionate love…

4th place: The Extreme of Love: The Cold-Blooded Public Security Officer's Passion Overflows in a Loveless Marriage (Deluxe Bad Boy Series)

“You swore you’d be my wife, didn’t you? Be a good girl and trust me.” — A cold-hearted yakuza husband spoils his fake bride with overwhelming love!?

Eina grew up without ever knowing her father, living alone with her mother. When her mother suddenly falls ill, Eina has no choice but to turn to the man she’s just learned is her father—a powerful yakuza boss. To save her mother, she agrees to an arranged marriage with Sho, a promising young member of the syndicate.

Sho, with his cold, unreadable eyes, treats Eina with a distant attitude. Though she suppresses her feelings and enters the marriage, she gradually discovers his tender side—and finds herself falling for him. Just as she begins to feel happiness in Sho’s growing affection and warmth, she learns the shocking truth: he’s actually an undercover cop sent to take down the organization…!