Ito is a second-year high school student and an only child who has to move to a different city; her mother remarried and begins her new life as an older sister of 4 siblings! The start of a family-love-comedy with four step-brothers ♥

Although Koharu is a little taller than the average person, she's a 15 year old girl who lives a much simpler life than the average person. Having no experience with love, she thought she'd spend her days peacefully with her group of ordinary friends. However, a destined encounter will change Koharu…!! * Volume 3 contains the side story "Kota x Haru" (コタ×ハル). * Volume 5 contains the side story "Kota x Haru: Hatsukoi High Jumper" (コタ×ハル～初恋ハイジャンパー～).

Haruko Nanase hasn’t always been the brightest student, but through sheer hard work she successfully enters a prestigious high school and is now at the top of her class. While riding the train one day, she witnesses a fight involving a guy wearing her school's uniform. When the fight is over, he demands that she pay him a fee for watching it but she escapes. The escape is not to last though, because the next day the guy turns out to be in the same class, and worse, his seat is next to hers.