Seto will play be playing Shimazu Tomokazu who is an English teacher at Kyoumeikan and an advocate and expert on the new teaching style i.e. active learning. Although Shimazu had studied in the UK and can speak like a native, he is very shy and keeps to himself so he is hardly noticeable among the students and teachers. Upon hearing about Shimazu's ingenious teaching style, Narumi is very excited about it and wants this to become one of the first things which the school should implement as part of its reforms. Shimazu is also secretly in love with his colleague Mashiba.
As part of preparations for the filming, Seto went to observe active learning lessons where he noticed that the students were actively taking part. As such, he could not help but think that if this learning method was in use when he was a student, he could have learnt more in a more enjoyable setting. As for his character in this drama, Seto commented that as Narumi and Shimazu will be aiming to change the school in the story, he hopes that this will provide a catalyst of change for the viewers and bring about a change in himself as well. Although there is always fear and worry about changing something or taking on a challenge, things may actually turn out to work out well.