Isekai Shoukan-sareta ga Kyousei Soukan-sareta Ore ha shikatanaku yaseru koto ni shita.

Toudou Haruhiko is a obese NEET who got summoned to a different world when he was about to get hit by a truck. Unfortunately the summoning system malfunctioned due to exceeding the weight-limit and he was sent back to his world with the summoner Princess Shella Stalion.He retained some Lv.1 skills, but one skill's level got corrupted into Infinity. So he got a powerful version of the skill Judgement, embodied as the cute girl Infinity-chan.She tells them that Shella can return to her homeworld if she can re-cast the summoning to open a portal - but that is conditioned on Haruhiko losing some weight.