Kibishii Onna Joushi ga Koukousei ni Modottara Ore ni Dere Dere suru Riyuu is a Manga/Manhwa/Manhua in (English/Raw) language, TIME TRAVEL series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
Average company worker Shimono spends his days constantly being helped and scolded by his superior and section chief Kamijou Touka. One day, he finds himself having traveled back in time to his high school years. He sees this as a chance to aggressively approach the section chief a second time around, only to find out that very woman had turned into a girl constantly acting lovey-dovey towards him! Through this leap in time begins a romantic story depicting this mutually unrequited love!