The youth story of Nohara Shinnosuke is too problematic, right?

My name is Nohara Shinnosuke. I am 15 years old. My favorite snack is chocolate biscuits. There is a father in my family who has recently been promoted to minister; a mother who is already 39-year-old Obasan; and a younger sister who was once the strongest baby on the surface , is now the strongest elementary school student; a dog named Xiaobai, whose special skill is cotton candy.
Kazama, Masao, Dumb, Nini: "Xiaoxin, you haven't changed much~"
Xiao Ai: "Master Xiaoxin, I haven't seen you in ten years, Xiao Ai misses you so much."
Nanazi: "Xiaoxin... In a blink of an eye, you are already a high school student, and I... I am already an obasan who is about to hit [-]..."
Shinomiya Kaguya: "Nohara-kun, come be my vice president"
Yukino: "Nohara-kun, why haven't you come to the service department for a while?"
Megumi Sage: "Only Nohara-kun... will notice me"
In short, this is a story about how Xiaoxin writes his own youth love comedy after entering high school. The heroine of the heroine (maybe later)