Unlike his fiery brother, Isami is calm, peaceful, and even jovial around others. However, he does share the same fiery passion when it comes to cooking. Isami tends to laugh at Takumi's brashness since he often ends up embarrassed when other people misinterpret his message. Other times he likes to tease Takumi whenever they have friendly fights when they cook or play games. Overall, the twins have a close bond and Isami does whatever he can to support his brother.