Three digital novels.
Lucia, the protagonist's fiancee, is trained as a slave by Royd, the antagonist (Screenshots 2-6).
The protagonist never got a chance to profess his love for the heroine and spends his days in envy. Then, a mysterious package arrives (Screenshots 7-8).
The protagonist wakes up in some kind of institution. His memory is gone. Something must have happened (Screenshots 9-10).
[From
DLsite english]