It is centered around a young couple on opposite sides of the law - Kazuma, the son of long line of police officers, and Hana, descendant of the infamous "L clan" of thieves.
This show provides examples of:
- Actor Allusion:
- Episode 9 has Kazuma fighting a group of baddies, and then tying them up, with a metal chain.
- Episode 11 has Waichi showing up on a motorcycle in a jacket with double white stripes on the sleeve.
- Arsène Lupin: As the title of the show suggests, the "L clan" is an allusion to Arsène.
- Badass Family: The L clan is three generations of badass.
- The Bad Guys Are Cops: The Mikumo family is treated as more sympathetic, leaning into this trope at times. Then full on embraces it in episode 10 when it's revealed that Emili's grandfather attacked Matsu as a teenager and has had it out for the L clan ever since.
- Black Sheep: Hana, due to initially not wanting anything to do with her family's crimes. Wataru is also treated like this due to never going outside his room.
- "Freaky Friday" Flip: The fifth episode of the second season involves Hana and Matsu swapping bodies after placing one of Wataru's ladybugs on the back of their necks.
- Generation Xerox: Hana and Kazuma were not the first members of their families to date each other.
- How Dad Met Mom: Both Hana and Kazuma's parents tell their story to each other. Matsu later explains her story as well.
- Identical Grandson: Both Hana and Kazuma look identical to a younger version their grandparents.
- I Want You to Meet an Old Friend of Mine:
- Meet the In-Laws: First Hana meets the Sakuraba family, then Kazuma meets the Mikumo family, and then the families meet each other. Naturally, Hana gets more tense with each meeting.
- Multigenerational Household: Kazuma's grandfather and Hana's grandmother both live with their children.
- No Longer with Us: Matsu keeps a photo of her husband on the table with some candles, leaving Kazuma to assume that he is dead.
- Not Allowed to Grow Old: After an eight year time skip in season two, the Mikumo family complain about growing too old to steal now, but they also still look exactly the same.
- Odd Name Out: The L clan gets new names that are just the same given name plus a different surname. Except Wataru. He gets stuck with the name Kevin because there were no other Wataru names available.
- Phantom Thief: Obviously the L clan, but also Hana's childhood friend.
- Pixellation: The show uses this whenever Matsu needs to pick a lock.
- Second Act Break Up: While toyed with prior, episode 7 ends with the L clan's secret being exposed and thus Kazuma and Hana must part ways. At least until Hana and her father crash Kazuma and Emili's wedding in episode 10.
- Secret-Keeper: Matsu helps Hana hide Kazuma's profession from her parents. Kazuma himself later has to hide Hana's identity from his parents.
- Secret Secret-Keeper: Both grandfathers (and also Matsu) knew all along of the other family's identity because they were all friends as teenagers.
- Star-Crossed Lovers: Hana and Kazuma, obviously. But also Matsu and Waichi, back when they were teenagers.
- Time Skip:
- Episode 9 skips forward one year.
- The second episode of season two skips forward nine months, and then the following episode skips eight years.
- Wham Episode:
- Episode 5 has Kazuma pleading that Hana not show up to save him this time. She does and he finally unmasks her, revealing her identity.
- Episode 7 ramps up the "whams" with Iwao revealing that he knew that the Sakurabas were cops, Misako snooping around and finding Etsuko's pendant, Takeru revealing the L clan secret to Kazuma, the Sakuraba family legacy being revealed to entire Mikumo family, and finally ending with the L clan being exposed.
- Episode 10 reveals a whole new side to the story that involves Matsu being engaged to Waichi and Emili's family being dirty cops.
