Let's end this NEET life of ours

Having a trauma of the outside world, Ren Black shuts himself for 1 year. Leaving his room remembers him of a tragedy between his deceased girlfriend. As a year passed, Ren decided to start highschool not disturbed by the past but having a shut in doesn't leave him. Enrolling in the middle of the school year, he misses the lessons taught before he enter. Yuki White the president of 1-A volunteered to support Ren in his studies but declined because Ren pass the exam having a perfect mark. Yuki was curious about Ren so decided to become his first friend. Will she be the one? Will Ren ends his shut in life? Can he move on now she resembles his former girlfriend?