The Many Weaknesses of Ayaka the Yankee JK is a Manga/Manhwa/Manhua in english language, ROMANCE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Her secrets that only I know... Izuki Hayashi, a timid otaku who has just entered high school and wants to become a manga artist, is sitting next to a very scary-looking Yankee JK! The way she talks, the way she looks, the way she acts, everything about her is terrifying... But it turns out, she has a lot of unexpected weaknesses?