赤坂アカ Book order (chronological)

In the entertainment industry, lying is both your strongest weapon and an exceptional form of love. Goro, a gynecologist and a massive B-Komachi stan, finds his life turned upside down when his newest patient turns out to be B-Komachi member Ai-chan herself! Despite the industry seeing children as a idol's death sentence, the 16-year-old Ai still desperately wants to give birth. So under the cover of secrecy, Goro helps the young idol with her prenatal care... only to be attacked and killed the night she's due to give birth. Reincarnated as one of her newborn twins, Goro (now Aquamarine Hoshino) gets to spend 24 hours a day in the arms of his favourite idol! But can a ditzy young idol with a life full of lies make a good mother? And what of Ruby, his suspiciously verbose sister? Source: Animeplanet

Two high school geniuses scheme to get the other to confess their love first. Two geniuses. Two brains. Two hearts. One battle. Who will confess their love first…?! As leaders of their prestigious academy’s student council, Kaguya and Miyuki are the elite of the elite! But it’s lonely at the top… Luckily for them, they’ve fallen in love! There’s just one problem—they both have too much pride to admit it. And so begins the daily scheming to get the object of their affection to confess their romantic feelings first… Love is a war you win by losing.