Senpai.

 is the first collaboration single by HoneyWorks meets TrySail.

CD

 * 1) Senpai. (センパイ. )
 * 2) BraveSail
 * 3) Senpai. (センパイ. ) -Instrumental-
 * 4) BraveSail -Instrumental-

Limited Anime Edition CD

 * 1) Senpai. (センパイ. )
 * 2) BraveSail
 * 3) Senpai. (センパイ. ) -MOVIE Ver-
 * 4) Senpai. (センパイ. ) -Instrumental-
 * 5) BraveSail -Instrumental-

Limited Edition DVD

 * 1) Senpai. (Music Video)

Limited Anime Edition DVD

 * 1) 『Suki ni Naru Sono Shunkan wo. ~Kokuhaku Jikkou Iinkai~』 Opening Movie