https://www.cmoa.jp/title/256303/

Karasawa Takayuki is a middle-aged 31 years-old man. He lives with his wife Mari. They have no children. Because each of them has their own secret circumstances, the two have been living in a fake marriage. But one day, a boy named Nagi moves in next door, and their peaceful life changes completely. This is the story of the strange five days he spends with the devilish boy.

https://www.cmoa.jp/title/307997/ "Why am I helping the man I love to date another woman!?" Nanten Mayu, a literary club member aspiring to be a novelist, fell in love that very day. However, the object of her affection turned out to be a major problem—a carefree guy named Yurano who hardly reads anything. To make matters more complicated, the one Yurano fancies is none other than Nanten’s senpai, Hanaen Kuren, the club president who effortlessly captivates everyone with his charm. Senpai Hanaen, after receiving a confession from Yurano, issues him a seemingly impossible challenge: "If you win a literary prize before graduating high school, then I'll go out with you!" Taking this condition seriously, Yurano makes an unexpected move: "Miss Nanten, please become my novel writing mentor!" Thus, Nanten finds herself drawn into helping Yurano in his pursuit of dating senpai Hanaen. Overwhelmed by her unreturned feelings—oscillating between delight and despair—and amidst the whirlwind antics of the eccentric club members, Nanten’s tumultuous youth story begins! Would you like to discuss further how this unconventional romance and humorous predicament might evolve, or explore similar narratives in youth literature?