Yashiro-kun no Ohitorisama Kouza

Shigeaki Yashiro is proud to be a loner, doing his own thing without getting involved with others. From studying alone in a karaoke room to relaxing by himself in open-air hot springs, Yashiro is an expert in finding the perks of doing things solo. But his solitary existence begins to unravel when Kanon Hanamizawa, one of the popular girls at school, asks him to teach her his ways. She knows just how exhausting keeping up with all the latest trends can be, especially since she's afraid to talk about her own uncool hobbies. Yashiro becomes Hanamizawa's reluctant teacher, but soon finds himself tangled in the antics of his apprentice's popular friends. A lone wolf could learn some new tricks from social butterflies!

(Source: J-Novel Club)