Vertical Subs

[V4 Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding
Style: vertical subs,Mikachan-PB,40,16777215,0,0,0, 0,0,1, 1,1,7, 20,20,20,0,128

[Events]
Format: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: Marked=0,0:00:00.70,0:00:03.11,vertical subs,,0000,0000,0000,,わ\Nた\Nし\N、\N\N桃\N宮\Nい\Nち\Nご\N。\N\N十\N三\N歳
Dialogue: Marked=0,0:00:03.47,0:00:05.40,vertical subs,,0000,0000,0000,,ご\Nく\N普\N通\Nの\N\N中\N学\N一\N年\N生

OR: Tate-chu-Yoko for "13"

Dialogue: Marked=0,0:00:00.70,0:00:03.11,vertical subs,,0000,0000,0000,,わ\Nた\Nし\N、\N\N桃\N宮\Nい\Nち\Nご\N。\N\N13\N歳

Method 2: With @-marked font (suggested by a Japanese subber)

[V4 Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding
Style: Default,@Mikachan-PB,30,&H00ffff,0,0,&H333333,-1,0,1,1,1,5,30,30,30,0,128

[Events]
Format: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: Marked=0,0:00:00.00,0:00:10.00,*Default,,0000,0000,0000,,{\pos(610,30)\frz270}わたし　桃宮いちご　十三歳
Dialogue: Marked=0,0:00:00.00,0:00:10.00,*Default,,0000,0000,0000,,{\pos(560,30)\frz270}ごく普通の　中学一年生