Merry Checker Mangaメリーチェッカ; Marry Checker; 欢乐检查员; 歡樂檢查員
Prequel to this manga is called The Guy Three Doors Down aka Sangen Tonari no Tooi Hito. Please check below for the link.
Blogger, Shio, meets up with some friends he met online through his blog. He is going to meet Miya (supposedly female), a blogger he hasn't met yet. He is surprised to find out that Miya is a very tall man who has a very calming effect on others.