"Ore, Party Nukeru wa" ga Kuchiguse no Skill [Shukushou] no D-rank Boukensha, Seijo to Kekkon shite Yuusha Party ni Kanyuu suru Hame ni Naru

Ard, an adventurer whose skill can only make things smaller, leaves his party whenever the party ranks up. He is repeatedly hired by other parties as a porter. But this man does all of this on purpose. Every time he gets paid after leaving, he feasts on meat and alcohol! The morning after, he is hungover! However, he announces the abrupt end of this crappy yet happy-go-lucky everyday lifestyle. Because he got married to the saintess Alistera, from the strongest hero party of the present age!! How!? (Source: Shounen Magazine Pocket)