Rainen no Koto wo Ie, Ore ga Warau

Ryousuke, a shut-in who’s a die-hard — no, hopelessly in love — fan of Hamura Yuusei, one half of the comedy duo “Mangosteen,” spends his days submitting jokes to their radio show's listener segment. But when Mangosteen suddenly announces their disbandment, Ryousuke is devastated and loses all will to live. That is, until one day, the very Hamura Yuusei himself shows up uninvited at Ryousuke’s family home…!? (Source: Kodansha, translated) *Note: Includes three extra chapters.*