|Futami Seiji二見 聖治|
|Hair||, Blond, Curly, Short, Side Tail, Spiky Bangs, Waist Length+, Wig|
|Eyes||, Amber, Tareme|
|Body||, Average Height, Pale, Slim, Teen, Trap|
|Clothes||, Forehead Necklace, Hoodie, Knee-high Socks, Micro Bikini, Off-The-Shoulder Shirt, Ribbon Hair Tie, Sailor Suit, School Uniform, Sports Shoes, Tank Top, Thigh-high Stockings, T-shirt|
|Personality||, Boku, Low Self-esteem, Opposite Gender Voiced, Timid|
|Role||, Apprentice, Classmate, High School Student, Older Brother, Twin Brother|
|Engages in||, Cross-dressing, Shopping, Twin Switch|
|Subject of||, Blessing, Teasing|
|Engages in (Sexual)|
|Subject of (Sexual)|
|Visual novels||Protagonist - Cute Resort ~Shiyou yo♥ Ecchi na Activity~|
Protagonist - Tincle ★ Twinkle Festival!
|Voiced by||Himuro Yuri (Partially)|
The protagonist himself. Seiji used to attend the all-boys' school next door, but was then forced to cross-dress as his twin sister by his own twin sister and attend her school as her. They both share the same face, but their personalities are completely different. Unlike Sena, who is smart and very confident, Seiji lacks confidence and is a tad timid. He is neither good at sports, studying or socializing; it's as if his twin sister sucked out all of his good traits to herself. So it comes out as quite a shock to him when he finds the whole school worshipping him.