Kyotani (y/n) age 17 has just moved back to Japan to be with her mom and her little half brother kentaro kyotani While being there will she meets someone New who might enlighten her life or will there be an old someone interrupting her life. Will she go back to her old ways n get worst or get better from her bad habits F reader x matsukawa issei I DONT OWN HAIKYUU ONLY OC AND (y/n) and the plot SLOW UPDATES