At the beginning of the story Ido gives us the impression that he has gone back in time, and regretting his previous actions is trying to redeem himself. I think it was his fault that Sejin killed himself.
I'm a massive fan of hers! I love Dokyuusei, Double Mint and Inheritance of Aroma! Her, Scarlet Beriko, Nishida Higashi, Zariya Ranmaru and Ogawa Chise are some of my favorites mangaka!
At the beginning of the story Ido gives us the impression that he has gone back in time, and regretting his previous actions is trying to redeem himself. I think it was his fault that Sejin killed himself.