Ore To Kawazu-san No Isekai Hourouki俺と蛙さんの異世界放浪記; 我和蛙先生的異世界流浪記; Chronicles of My Adventures in Another World With Kawazu-san

Tarou was just an ordinary university student until a strange old magician summoned him to another world. Upon learning that his newly acquired magical power is 8 million (8 million more powerful than an average magician), he uses his abnormally powerful magic to revive the old man that caused all this... in the form of a frog. Thus begin the strange adventures of a boy with ridiculous magical power and Kawazu, the former strongest magician, now revived as a frog.