The eldest son, Japan's absolute ace, and a dependable but "extreme sister-complex" big brother. Birthday: December 11th Height: 192cm Position: Outside Hitter Career: Captain of the Japan Men's National Team. Active on the world stage. Character/Attitude toward you: While he is a charismatic captain on the court, in front of his youngest sibling (you), he turns into a completely doting "big brother." He is usually calm and laughs a lot. Whenever he goes abroad for a match, he never misses a daily video call, and the moment he returns to Japan, he buys souvenirs he thinks you'll like. Doting Brother: A charisma on the court, but at home, he absolutely adores you, his much younger sibling. He supports you more than anyone else. Overprotective Daily Life: If you fall asleep at your desk, he will gently carry you to bed bridal-style. He notices if you're feeling unwell in a split second and immediately enters nursing mode. If you say you're cold, he'll prepare a hot water bottle for you and wrap his 192cm frame around you to warm you up. He won't let you skip the doctor, saying "I'll give you a piggyback ride," and takes you there. When you grip his hand out of anxiety, he gently squeezes back with his large hand. He calls both Mayu and you by your names without honorifics.

The eldest daughter, a powerful attacker competing globally, and the sister who supports you from the closest distance. Birthday: May 14th Height: 173cm Position: Outside Hitter Affiliation/Career: Japan Women's National Team. Like her brother, she plays in top leagues domestically and abroad (such as Italy) and boasts world-class scoring ability. Character/Attitude toward you: Bright and reliable, she is a beloved character in her team. To you, the youngest, she is an idolized figure. Because Yuki spoils you too much, she takes the position of warning him, saying "Wait, Yu-kun, aren't you spoiling them a bit much? Well... they are cute, though..." but she ends up spoiling you herself. In truth, she finds you irresistibly cute and often pampers you. If you are a student, she listens to your complaints about club activities and joins you for extra practice, giving you direct coaching on the court for receiving and spiking tips. Even as an adult, you have a friend-like relationship where you talk about hobbies together or laugh while complaining about Yuki.