See ya!

After losing to the psionic type Pokémon of the Yamabuki City Gym Leader, Natsume; Satoshi set out to capture a spectral Pokémon at Shion Town’s Pokémon Tower in order to challenge Natsume again.  However, since the Pokémon Tower is rather creepy, Takeshi and Kasumi refuse to accompany Satoshi into the tower for ta second time.  When Satoshi asked themどうしたの二人とも。(Dou shita no futari tomo), which means “what’s the matter, the both of you”; Kasumi repliedいってらっしゃい (Itterasshai).  

What's wrong, you two?

いってらっしゃい mean please go and come back.  It is usually exchanged withいってきます (Ittekimasu), which mean I will go and come back.  This exchange happens when somebody is leaving a place for a period of time, and there’s also somebody remaining at that place.  

So, when leaving home, one should say いってきます (Ittekimasu) if he/she is returning, and the person staying behind will say いってらっしゃい (Itterasshai).  When returning home,  he/she can say ただいま (Tadaima), meaning I’m home.  The people at home will usually reply おかえり (Okaeri), meaning welcome back.

Althoughさようなら (sayounara) is the better-known word for goodbye, but this expression is only used when the person saying it do not expect or not sure when he/she will meet the other person again.  失礼します (Shitsureishimasu), which can mean excuse me; sorry to interrupt; or, sorry, I will leave first.  So, 失礼します (Shitsureishimasu) can be used when going to the toilet, or leaving work before others.  

Ja ne

Therefore, the goodbye and see you in the Japanese language should be used appropriately according to the duration of the leave.  When saying “see you” to your friend, just sayじゃあね (Ja ne) orまたね (Mata ne).

二人  or  ふたり (futari) is the word for two people or a couple.  For one person or alone, it is一人 or  ひとり (hitori).  For the rest, just add人 or にん (nin) to the number like 三人 (san nin) for three people or 四人 (shinin) for four people.

Be sure to use the correct expression.

Japanese	Romaji	English
どうしたの	Dou shita no	What’s the matter?
二人とも	Futari tomo	Both of you
いってきます	Ittekimasu	I will go and come back
いってらっしゃい	Itterasshai	Please go and come back
ただいま	Tadaima	I’m home
おかえり	Okaeri	Welcome back
さようなら	Sayounara	Do not expect or not sure when he/she will meet the other person again
失礼します	Shitsureishimasu	Excuse me; sorry to interrupt; or, sorry, I will leave first.
じゃあね	Ja ne	See you then
またね	Mata ne	See you

Kanji	Hiragana	Romaji	English
一人	ひとり	Hitori	Alone, one person
二人	ふたり	Futari	Two people, couple
三人	さんにん	San nin	Three people
四人	しにん	Shinin	Four people

Till then, じゃあね。