Isekai Shoukan-Sareta Ga Kyousei Soukan-Sareta Ore Ha Shikatanaku Yaseru Koto Ni Shita. Toudou Haruhiko is an obese NEET, who was transported to a different universe when a truck was about to reach him. Unfortunately the summoning device failed due to exceeding the weight-limit and the summoner Princess Shella sent him back to his planet.
He retained some skills of Lv.1 but the amount of one skill was corrupted into Infinity. So he was given a powerful version of the Judgment ability, represented as the sweet Infinity-chan kid.
She informs them that if Shella loses any weight, she should return to her homeworld so she can re-cast a call to open a portal.