"I just met her today and yet, why am I feeling so excited? What could be wrong with me?"
Narumi was a successful and popular man who had grown tired of the mundaneness of life, everything always went his way. Takanashi, on the other hand, was a passionate woman who dedicated herself to her hobbies and work. People often referred to her as "the tuna who'd die if she stopped swimming".
By some strange twist of fate, these two polar opposites found themselves attending a marriage interview. Narumi had no intention of accepting the other party but during the interview, an attacker appeared, and Takanashi flawlessly handled the situation with magnificent martial arts skills. Narumi had always looked down on Takanashi as being a straight-laced oddball, but he soon realized that she was actually Taka-san, a mysterious person whom he held in high regard. Before he knew it, he had already embraced her.
This unlikely and adorable first love story is filled with humor and eroticism.