These are novel illustrations that were included in volume 19
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Novel Illust. - Prologue - Interlude 01 - Cool in the Cafe - Interlude 02 - Diamond Passion Interlude 03 - Innocence Wander - Epilogue - Post Epilogue (1 - 2 - 3) - Author's Notes
Novel Illust. - Sweet Day: Sweet Morning - Sweet Day: Sweet Before I - A Day For You 01 - Sweet Day: Sweet Before II A Day For You 02 - Sweet Day: Sweet Before III - A Day For You 03 - Sweet Day: Sweet Midnight To Conquer the Phalanx - Author's Notes
Novel Illust. - Happy Hot Dash - Morning of You and Me - Impact of Childhood 01 - Lunchtime of You and Me Impact of Childhood 02 - Dinnertime of You and Me - Impact of Childhood 03 - Nighttime of You and Me Happy Birthday - Author's Notes
Novel Illust. - Prologue - Cadenza Road Itto: Part 1 - Cadenza Road Itto: Part 2 - Epilogue Bottled Letter For You - Ghost in Ghost - Author's Notes