When Kirisu’s plans for an end-of-day bath are ruined when her building has no hot water, she’s forced to go to a public bath, and not only runs into Asumi, but Nariyuki and his two youngest siblings Kazuki and Nazuki.
The little ones are the source of a number of issues, like when they steal Kirisu’s underwear, or try to get her to agree to marry their big brother. They act like little kids, and when Kirisu is too stern with them, they cry.
The baths provide a rare opportunity for Kirisu and Asumi to talk, but end up not really talking about anything other than Kirisu’s exquisite skin, and Nariyuki’s kindness and penchant for going the extra mile to help others.
Naturally, since this segment involves people not wearing clothes, Nariyuki inevitably sees Kirisu naked, as Hazuki rips off her towel when she berates her big bro for being shameless when all he did was answer a call for help, a rare case of being allowed to cross the gender lines of the bath.
The next segment is all about mock college interviews, which Rizu in particular is very apprehensive about. Those concerns only intensify when the kind teacher who was going to interview her and Fumino calls out sick, and Kirisu is her substitute.
Needless to say, she’s about as hard on the two as an interviewer can be, leaving them steaming and deformed. Kurisu forces Nariyuki to have a surprise interview, and he’s so tired he hallucinates her wearing a school swimsuit and maid outfit, among other costumes.
The turning point is when Nariyuki respectfully gets up and leaves, because he isn’t confident he can give Kirisu the answers she wants, but he’ll strive to find out how to provide them in the future. That, Kirisu tells him, is the stength she asked him to describe: the one that faces his own limitations (and those of others) and works out the best way to overcome them.
That doggedness has rubbed off on his tutees, as Fumino and Rizu are found in the library, determined to be better prepared in their next mock interviews. In this way, Kirisu gave them a tough-love kick in the pants they needed to put their best selves forward when the real ones come around.