Hitsuzen

The people they are after Yuko leaves, and Watanuki takes her place, are very different from the people they were before Yuko came into their lives.  Watanuki used to get very annoyed every time Domeki came over and ruined his chances with Himawari, joining in with Yuko and Mokona in mocking him and saying he's a big whiner and he'd make a fitting housewife if he could just hold his sake.  Now, he welcomes Domeki as an old friend, the only one who understands his physical and emotional pain; after falling out of that window when they were in second year together... well, now Watanuki finally understands why Yuko discouraged their relationship without Domeki present.