It's a nice book, but you really oughta fix that romanized title.
As words, your romanization would be right for the kanji, but that's clearly how Kasen's given name is written.
And brush up on your kana; that "tsu" is a small "tsu"--a sokuon--indicating doubling of the following consonant.
Therefore, Kasenppai.

Base +10

http://www.doujinshi.org/book/446329/

Base +55

http://www.doujinshi.org/book/446329/Kasenppai!/
English Translation: /g/430398/b3c28944ad/
Spanish Translation: /g/512921/5190ddcfb4/

Base +47