Off-Kai Shitara Tondemonai Yatsu ga Kita Hanashi

Megumi Miki is a single woman who has always kept her otaku hobbies to herself!
She wants to have a friend to talk to about her favorite characters... So she tries to arrange an IRL meetup with her SNS follower... only to have an intimidating yakuza man show up!
She feels like her life might be in danger, but when she actually talks to him, she finds that he is a true hard-core otaku!
He may be a bit touchy about the proper coupling, but he's fun to be around and he's surprisingly reliable!

(Source: Kodansha, translated)