Kouta, who was raised in a single-mother household, still leaned on Yui even after becoming a college student. Yui, not wanting to burden Kouta because of their single-mother situation, had always spoiled him, leading to Kouta becoming a mama's boy. Now in his third year of college, Kouta shows no signs of being able to function independently in society. Hoping to give him a push towards independence, Yui invited Kouta on a hot spring trip.
