Sleep zzz... Lyrics - Nisekoi

Sleep zzz... Lyrics - Nisekoi belongs to the anime Nisekoi, take a look at the argument:

Raku Ichijou, a remarkable first-year student at the prestigious Bonyari High School, finds himself bound by destiny to an infamous yakuza family. Encumbered with an enigmatic pendant sporting a locked mechanism, Raku clings to the distant memories of a childhood promise. The key to the pendant's secrets remains with the girl who disappeared from his life years ago. Fast forward to the present, and Raku merely yearns for an unremarkable existence, quietly navigating his way alongside his long-time crush, the captivating Kosaki Onodera. Alas, tranquility eludes him when the ruthless American Bee Hive Gang trespasses on his family's territory. His dreams of a blissful romance are abruptly shattered, forcibly propelling Raku into a vexing predicament. To alleviate tensions between the feuding factions, Raku is coerced into a charade, masquerading as the devoted lover of Chitoge Kirisaki—the stunning daughter of the Bee Hive's chief. Yet, bitter irony envelops their blossoming relationship as their initial encounter ignites an intense and mutual loathing. Raku perceives Chitoge as an untamed gorilla, while she sees him as nothing more than a spineless weakling. Embark on a captivating journey with Nisekoi, as it unravels the daily escapades of this peculiar and ill-matched couple, bound by circumstance and compelled to coexist for the greater good of their city. Amidst the chaos, numerous girls from Raku's past inevitably reemerge, each holding a unique connection to his heart and the promise he holds dear. Brace yourself as Raku's pursuit for truth leads him down unexpected paths, riddled with twists and turns that will leave you yearning for more.

Now that you know the argument, take a look to another songs of Nisekoi also called False Love | ニセコイ