Kou-2 ni Time Leap Shita Ore ga, Touji Suki datta Sensei ni Kokutta Kekka

Seiji Sanada, a 30-year-old wage slave, woke up one morning and had time leaped back to the spring of his sophomore year of high school. Seiji, who had long regretted graduating without confessing to his beloved world history teacher, Haruka Hiiragi, resolved that this time, he'd confess to her. Her response was... An astonishing "Okay?!?!?!?!" The two of them began discretely dating. It was supposed to be the start of their *vie en rose*... but Hiiragi-sensei is a woman so sweet, she'll spoil her man rotten!!! A super flirtatious rose-colored school life begins!!!

(Source: Square Enix)