Toshoshitsu No Kanojo Seiso Na Kimi Ga Ochiru M... -

This looks like Japanese Romaji (Romanized Japanese). Based on common light novel, manga, or web novel title conventions, this is likely the beginning of a longer title. A probable full title could be:

(図書室の彼女 ～清楚な君が堕ちるまで～) Which translates to "The Library Girlfriend: Until the Pure You Falls" — a theme often found in romantic or dramatic stories involving an innocent girl in a library setting. Toshoshitsu No Kanojo Seiso Na Kimi Ga Ochiru M...